1. Foolish; totally unsound
   "That's a moronic idea";
   - crazy [informal], half-baked [informal], screwball [informal], softheaded, crackpot [informal], nutty [informal], wiggy [US, informal]
    
2. [archaic, informal] Having a mental age of between eight and twelve years
   "His moronic comments during the meeting embarrassed his colleagues"

See also: absurd, cockeyed [informal], derisible, derisory, idiotic, impractical, laughable, ludicrous, mentally retarded, nonsensical, preposterous, ridic [informal], ridiculous

Encyclopedia: Moronic