- intelligent (adj.)
- c. 1500, a back-formation from intelligence or else from Latin intelligentem (nominative intelligens), present participle of intelligere, earlier intellegere (see intelligence). Intelligent design, as a name for an alternative to atheistic cosmology and the theory of evolution, is from 1999. Related: Intelligently.
- unintelligent (adj.)
- c. 1600, from un- (1) "not" + intelligent (adj.). Related: Unintelligently.