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Adjective: inane (inaner,inanest)  i'neyn
  1. Showing a lack of intelligence or thought; stupid and silly
    "Mel made a few inane comments about the importance of chewing only on the left side of one's mouth";
    - asinine, fatuous, mindless, vacuous

Derived forms: inaner, inanest

See also: daft, dumb, foolish, stupid