Elementary, simple, fundamental, merely functional.
Of or pertaining to a base; having a pH greater than 7.
Unremarkable or uninteresting; boring; uncool.
Necessary, essential for life or some process.
An elementary building block, e.g. a fundamental piece of knowledge.
A necessary commodity, a staple requirement.
Basic training.
Being from outside a country; foreign.
Outdoor.
Relating to the outside parts or surface of something.
Foreign lands.
The outside part, parts or surface of something.