basic

Necessary, essential for life or some process.

• Flour is a basic ingredient of bread.

Elementary, simple, fundamental, merely functional.

• The Hotel Sparta’s accommodation is very basic.

Of or pertaining to a base; having a pH greater than 7.

Unremarkable or uninteresting; boring; uncool.informal

• I'm not saying people are jealous of Hathaway because she is so perfect. Yes, she does have it all — husband, healthy career, good looks. But she doesn't do anything in an "awesome" way. She's basic.
• "I couldn't get into it, I could barely understand what he's saying – it had too much cursing and explicit language," said Cortnee Brandon. "I think his lyrics are easy...he's basic. Kendrick Lamar is kind of overrated."

A necessary commodity, a staple requirement.plural-normally

• Rice is a basic for many Asian villagers.
• The cabin was stocked with all the basics.

An elementary building block, e.g. a fundamental piece of knowledge.plural-normally

• Arithmetic is a basic for the study of mathematics.
• I know the basics of sailing and would love to learn more.

Basic training.

• The drill sergeants gave him hell in basic.