airtightadjective
uk/ˈeə.taɪt/us/ˈer.taɪt/completely closed so that no air can get in or out:
Biscuits will stay crisp if you keep them in an airtight container.
Thesaurus: synonyms and related words
Open and closed
- ajar
- barred
- closed
- crack
- gaping
- hermetic
- hermetically sealed
- latch
- open
- outspread
- patency
- sealed
- shut
- to
- undone
- watertight
- wide-eyed