rigid

From Wiktionary
rigid is on the Academic Word List.

Pronunciation[change]

Adjective[change]

Positive
rigid

Comparative
more rigid

Superlative
most rigid

  1. A rigid object does not bend.
    It's possible to use flexible materials to form a rigid structure.
  2. fixed rather than moving
  3. rigorous and unbending
  4. uncompromising