Of actions, feelings, thoughts, words, etc.: Void of any real worth, usefulness, or significance; leading to no solid result; hence, ineffective…

Mad, insane, foolish, stupid. Obsolete.

Giddy, foolish; fickle, inconstant. (In later literary use reintroduced from modern French.) Also in combination volage-brained.

as adj. Foolish, silly. adv. Foolishly, sillily.

Of a person, person's heart, etc.: lacking good sense or judgement; unwise. Later also in weakened sense: silly, ridiculous.

Of persons: devoid of sense or wisdom; foolish, silly, thoughtless; of an idle or futile nature or disposition. Now rare or Obsolete.

Full of idleness, idle.

= volage, adj.

Senseless, foolish. In later use: Thoughtless, flighty, giddy (said esp. of women).

Lacking in judgement or common sense; foolish, rash, stupid.

Ape-like in manner; befitting an ape; fantastically foolish, affected, silly, trifling.

Of a person: having or showing little intelligence; lacking knowledge or sense; foolish, empty-headed. Of the mind, brain, etc.: free from thoughts…

Of a person: lacking in judgement or common sense; foolish, thoughtless, empty-headed; characterized by ridiculous or frivolous behaviour.

Characterized by lack of seriousness, sense, or reverence; given to trifling, silly.

light-minded, easily influenced.

With reference to the thoughts or reasoning, forming adjectives with the sense ‘having (a) frivolous or foolish ——; characterized by frivolous ——’…

figurative. Vain, empty, unsubstantial, trifling. Also, of a person: Having no depth of character, conviction, knowledge, etc.; shallow.

Resembling an owl; characteristic or reminiscent of an owl.

easily distracted; foolish, scatterbrained, bird-brained.

(a) adj. having or showing little intelligence; lacking sense; foolish, frivolous; (b) n. (with the and plural agreement) empty-headed people as a…

Of little understanding or intellect; silly, foolish; crazy.

= empty-headed adj. n.(a).

Characteristic of a marmoset; apishly foolish.

foolish, senseless, superficial.

Empty-headed, hare-brained, silly.

colloquial. Of a person: full of nonsense; ridiculous, silly. Obsolete.

giddy-brained.

Lacking in intelligence or common sense; foolish, silly, empty-headed.

Giddy; = swimming, adj. 5.

lacking intelligence or common sense; = soft-headed, adj. 2.

Light-headed, foolish.

quasi-adj. Light, tossed hither and thither.

Having a head in the form of or resembling a drum; (figurative) empty-headed, foolish.

Lacking in judgement or common sense; foolish, thoughtless. Cf. feather-brained, adj.

giddy, thoughtless, foolish, crazy.

Foolish, silly; playing the fool, idly trifling.

= scatter-brained adj. at scatter-brain, n. derivatives.

With reference to the thoughts or reasoning, forming adjectives with the sense ‘having (a) frivolous or foolish ——; characterized by frivolous ——’…

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

giddy, thoughtless.

Wild; mischievous; frivolous, foolish. See halokit adj. at halok, n. derivatives.

= feather-headed, adj.

Of persons, their actions, etc.: Void or destitute of sense; silly, senseless; empty-headed.

= weather-headed, adj.

Foolish, unintelligent; frivolous. Cf. airheaded adj. at airhead, n. derivatives.

Typical of or appropriate to a tomfool; very foolish; absurd, ridiculous.

having or characterized by a brain supposed to be as small as a bird's; foolish, unintelligent; cf. bird-witted adj. at bird, n. compounds 2a.

Weak-headed, silly, dazed.

figurative, often with reference to personal character or intellect.

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

Wandering in thought or speech; vague, distant, ‘scatty’.

Scatter-brained. rare.

Foolish, silly; flighty, scatterbrained.