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Adjective: dippy (dippier,dippiest)  di-pee
  1. Informal or slang term meaning insane, strange, eccentric or stupid
    "I think he's going dippy";
    - balmy [archaic], barmy, bats, batty, bonkers, buggy [N. Amer], cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky, daffy, daft as a brush [Brit], potty [Brit], nutsy [N. Amer], wacko, round the twist [Brit], cuckoo
  2. Guided by whim and fancy
    - flighty, flyaway, head-in-the-clouds, scatterbrained

Derived forms: dippiest, dippier

See also: frivolous, insane