Weak and likely to lose consciousness.

synonyms: faint, light, light-headed, swooning.

Lacking seriousness; given to frivolity.

synonyms: airheaded, dizzy, empty-headed, featherbrained, giddy, light-headed, silly.

Roget 503: insane, mad, lunatic, loony [Coll.]; crazy, crazed, aliene^†, non compos mentis; not right, cracked, touched; bereft of reason; all possessed, unhinged, unsettled in one's mind; insensate, reasonless, beside oneself, demented, daft; phrenzied^†, frenzied, frenetic; possessed, possessed with a devil; deranged, maddened, moonstruck; shatterpated^†; mad-brained, scatter brained, shatter brained, crackbrained; touched, tetched [Coll.]; off one's head.    [behavior suggesting insanity] maniacal; delirious, lightheaded, incoherent, rambling, doting, wandering; frantic, raving, stark staring mad, stark raving mad, wild-eyed, berserk; delusional, hallucinatory.    [behavior somewhat resembling insanity] corybantic^†, dithyrambic; rabid, giddy, vertiginous, wild; haggard, mazed; flighty; distracted, distraught; depressed; agitated, hyped up; bewildered etc. (uncertain) 475.    mad as a March hare, mad as a hatter; of unsound mind etc. n.; touched in one's head, wrong in one's head, not right in one's head, not in one's right mind, not right in one's wits, upper story; out of one's mind, out of one's wits, out of one's skull [Coll.], far gone, out of one's senses, out of one's wits; not in one's right mind.    fanatical, infatuated, odd, eccentric; hypped^†, hyppish^†; spaced out [Coll.].    imbecile, silly, etc. 499.    ... show more