1. ((informal) stupid, slow witted or dull) stupid
   - blockheaded, boneheaded, duncical, duncish, fatheaded, thick, thickheaded, thick-skulled, wooden-headed, birdbrained, thick-witted

See also: stupid

• onion salt
• onion smut
• onion stem
• onion thrips
• onion yellow dwarf
• onion yellow-dwarf virus
• onionskin
• Oniscidae
• Oniscus
• online
• onlooker
• onlooking
• only
• only if
• only too
• only when
• Ono
• Onobrychis
• Onobrychis viciaefolia
• Onobrychis viciifolia
• Onoclea
• Onoclea sensibilis
• Onoclea struthiopteris
• onomancer
• onomancy