adj .
basic ; crude ; unformed or undeveloped 근본적인 ; 초기의 ; 미성숙한 또는 미개발의

• The primitive tribe's tools were very rudimentary. In fact, they looked more like rocks than like tools.
• The boy who had lived with wolves for fifteen years lacked even the most rudimentary social skills.
• The strange creature had small bumps on its torso that appeared to be rudimentary limbs.
  그 이상한 생물체는 발달이 덜된 팔다리처럼 보이는 작은 혹들을 몸통에 달고 있었다.