1. A heavy dull sound (as made by impact of heavy objects)
   "We heard the clunk of footsteps on the stairs";
   - thump, thumping, clump, thud, clonk
    
2. [N. Amer, informal] A stupid person; used to express a low opinion of someone's intelligence
   "The teacher scolded the class clown, calling him a clunk";
   - dunce, dunderhead [informal], numskull [informal], blockhead [informal], bonehead [informal], lunkhead [N. Amer], hammerhead [informal], knucklehead [informal], loggerhead [archaic], muttonhead [informal], dumbass [N. Amer], lamebrain [informal], pea brain [informal], chowderhead [N. Amer, informal], chucklehead [informal], bubblehead [informal], numbskull [informal], dumbhead [N. Amer, informal], twonk [Brit, informal], dumbo [informal], thickhead [informal], lunk [N. Amer, informal]

1. Make a loud thud
   "The wrench clunkd against the metal pipe";
   - clonk

Derived forms: clunked, clunks, clunking

Type of: dolt [informal], dullard, meatball [N. Amer, informal], pillock [Brit, informal], pudden-head [US, informal], pudding head [informal], sound, stupe [N. Amer, informal], stupid [informal], stupid person

Encyclopedia: Clunk