no-frills 
adjective
Without unnecessary extras, especially ones for decoration or additional comfort: cheap fast food in no-frills surroundings...
- Rationing, which existed until 1951, was still in place and the diet consisted of basic, no-frills meals.
- Millions of extra seats will be available during the summer as no-frills carriers begin new routes.
- The future of no-frills airlines may be the subject of much speculation in Europe, but Asia is happily embracing the phenomenon.
- inauguration
- inauguration day
- inaugurator
- inauguratory
- inauspicious
- inauspiciously
- inauspiciousness
- inauthentic
- inauthentically
- inauthenticity
- in a vacuum
- in a way (or in some ways or in one way)
- in a whirl
- in a word
- in a world of one's own
- in a —— light
- in back
- in ballast
- inbd.
- in bed with
- in-between
- in-betweener
- (in) between times (or whiles)
- in bits
- in black and white