rudimentary

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rudimentary /ˌru dəˈmɛn tə ri, -tri/

adjective

1. pertaining to rudiments or first principles; elementary: a rudimentary knowledge of geometry. 
2. of the nature of a rudiment: undeveloped or vestigial.
3. primitive.

1. fundamental, initial
2. embryonic

Antonyms

1. advanced
2. mature

Source: Dictionary.com