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

• in your birthday suit
• in-basket
• in-between
• in-bounds
• in-chief
• in-depth
• in-fighting
• in-house
• in-joke
• in-law
• in-line skate
• in-migration
• in-person
• in-service
• in-situ
• in-tray
• in-your-face
• inability
• inaccessibility
• inaccessible
• inaccessibly
• inaccuracy
• inaccurate
• inaccurately
• Inachis