= mad-brained, adj.

Insane; impetuous.

Having or manifesting a mad brain; hot-headed, uncontrolled, scatterbrained. Also figurative.

Mad, crazy; idiotic, wildly impulsive or extravagant; bizarre, zany.

= shatter-brained adj. (Cf. scatterheaded, adj.)

crazy, light-witted; giddy, thoughtless. Cf. scatter-brained adj. at scatter-brain, n. derivatives.

= shatter-brained adj. at shatter-brain, n. derivatives (in dictionaries).

that is a scatter-brain; characteristic of a scatter-brain.

Harebrained; mentally deranged.

Confused, fuddled, vague. Cf. woozy, adj., muzzy, adj.

Of a person: scatter-brained; driven distracted, mad; of a story, etc.: illogical and absurd.

Foolish, silly; flighty, scatterbrained.