rudimentary

Adjective

• not fully developed in mature animals
  • rudimentary wings
    

• being in the earliest stages of development
  • rudimentary plans
    

• being or involving basic facts or principles
  • the fundamental laws of the universe
    
  • a fundamental incomatibility between them
    
  • these rudimentary truths
    
  • underlying principles
    

Related words

• Synonyms: 
  vestigial , fundamental , underlying