1. in the sense of fundamental
- rudimentary
- fundamental
- principal
- primary
- chief
- cardinal
- elemental
- elementary
- central
- root
- critical
- pivotal
- focal
- key
- staple
- salient
- quintessential
- essential
- stripped down
- bare-bones
- vital
- cut down
- indispensable
- necessary
- intrinsic
- foundational
- ingrained
- underlying
2. in the sense of lowest
- bottom
- lowest
- ground
- starting
- without commission
- undermost
- simple
- plain
- straightforward
- unsophisticated
- unadorned
- adequate
- unornamented
- undecorated
- spartan
- without frills
- stark
- sparse
- austere
- severe
- meagre
- limited
- patchy
- rudimentary
- minimal
- sketchy
- ordinary
- modest
- unostentatious
- unpretentious
- homely
- unfussy
- rough
- homespun
- rough-hewn
- rough and ready
- makeshift
- crude
- muted
- restrained
- bog-standard
3. in the sense of fundamentals
Example Sentences of Basic
1. He understands the basic principles well.
2. This course covers basic concepts thoroughly.
3. Basic needs must be fulfilled.
4. They learned basic skills in school.