never-endingˌnever-ˈending adjective 
Examples
Keeping the house neat and clean is a never-ending battle.► see thesaurus at permanent
ExamplesEXAMPLES FROM OTHER DICTIONARIES
Thesaurus- To Miguel, the boredom of married life seemed never-ending.
- His was a never-ending search for a fix.
- I saw it as a never-ending drain on our meagre stock of rope and timber.
- People went in and out of her home in a never-ending procession.
- That is the latest bizarre instalment in the never-ending story of extraordinary events at Underhill.
- The descent is never-ending - I am glad - until Tony comes towards me.
- The youngsters, ages 2 to 17, provide a never-ending source of story lines.
- Their life had become a never-ending trudge to keep the Looms of the necromancer weaving dreadful enchantments.
- They are a kind of a never-ending source of amusement, amazement, and discouragement.
THESAURUS► permanent
seeming to continue for a very long time SYN endless: continuing forever, for a very long time, or for the rest of your life: · She has permanent damage to her eyesight.· the search for a permanent solution to the problem· They’ve offered her the job on a permanent basis.
► lasting continuing for a very long time – used especially when something continues to affect someone or something for a long time: · The experience left a lasting impression on him.· Things that happen in early childhood can have a lasting effect on your life.· Shelley was to have a lasting influence on him.· Is there any hope for a lasting peace in the Middle East?
► never-ending continuing so long that you think it will never end – used especially when something needs a lot of effort: · Keeping the house clean is a never-ending battle.· It was a never-ending task.· The search was never-ending.
► perpetual a perpetual state or feeling seems to be there all the time – used especially about something that is very annoying, worrying, or tiring: · For many working mothers, balancing the demands of children and job is a perpetual challenge.· The people live in a perpetual state of fear.
► everlasting continuing forever – used especially in the following phrases: · Gold is the symbol of everlasting love.· He promised them everlasting life.
► eternal continuing forever – used especially in the following phrases: · Do you believe in eternal life?· the secret of eternal youth· She has my eternal gratitude (=I will always be grateful to her).· You’re always the eternal optimist. (=you always think that good things will happen)
Longman Language Activatorremaining or continuing forever► permanent continuing forever, for a very long time, or for the rest of your life: · The car accident has caused permanent damage to her eyesight.· Most police departments keep a permanent record of all violent crimes committed in their area.
► eternal: eternal life/youth/salvation etc life etc which continues forever: · The possibility of eternal life is a principal belief of many religions.· the search for eternal youth
► everlasting a word used especially in religious contexts, meaning continuing forever: · life everlasting· the Buddhist's search for everlasting peace
► perpetual a state or feeling that is perpetual seems to be there all the time and is very annoying, upsetting, worrying etc: · For many working mothers, balancing the demands of children and job is a perpetual challenge.· Her husband's perpetual jealousy strongly affected their marriage.
► never-ending having no end, or continuing so long that you think it will never end: · To Miguel, the boredom of married life seemed never-ending.· Keeping the house neat and clean is a never-ending battle.
► infinite continuing forever and never ending or stopping: · It's difficult to really imagine an infinite universe.· She was a woman of seemingly infinite patience.
when something unpleasant continues for a long time► continual use this about something annoying or unpleasant that continues for a long time without stopping: · The deadline was getting closer and we were under continual pressure to reach our targets.· The exhaustion felt by new parents comes from the continual disturbance of their sleep patterns.
► constant use this about an unpleasant or frightening situation that continues for a long time without stopping: · She has learned to put up with the constant roar of trucks and cars whizzing by.· People under the regime lived in constant fear.· Lehman is in constant pain, and suffers from a severe form of arthritis.
► perpetual use this about an unpleasant or upsetting situation that is always there and does not change: · For many working mothers, balancing the demands of children and job is a perpetual strain.· Those who remain in the city are in perpetual danger of being hit by bullets and shells.
► incessant something unpleasant and annoying, especially a noise, that is incessant continues over a long period of time and never stops: · Outside the window is the incessant noise of cars and buses.· She gave two- or three-word answers to reporters' incessant questions .· The incessant rain has meant that many matches had to be cancelled.
► nagging: nagging doubt/fear/worry/suspicion etc a doubt etc that is probably unnecessary but that stays with you all the time and does not go away: · She had a nagging worry that she hadn't done enough to prepare.· I have a nagging feeling that I forgot to do something.· There are still some nagging doubts about the future of the company, though for now it is doing well.
► endless/unending/never-ending use this about something unpleasant, boring, or tiring that continues for so long that you think it will never end or change: · How can I stop my children's endless quarrelling?· The wet winter days seemed at times unending.· His immune system failed, and he caught a never-ending series of viruses and infections.
► persistent a persistent problem or illness is not very serious but it continues to exist even though you try to get rid of it: · He has a persistent cough because of his smoking.· The country has suffered from persistent economic problems.
► unrelenting formal an unpleasant situation or feeling that is unrelenting continues for a long time without stopping: · The unrelenting pressures of the job started to affect her health.· The relief efforts have been hindered by unrelenting bad weather.· The unrelenting air attack on the country continued.
Keeping the house neat and clean is a never-ending battle.► see thesaurus at permanent