Synonyms for Birdbrained:

• adj.

  •bird-brained (adjective)
  • silly.
  •fatuous (adjective)
  • mindless,
  • witless,
  • simple,
  • brainless,
  • dense,
  • dull,
  • idiotic,
  • puerile,
  • foolish.
  •flighty (adjective)
  • volatile.
  •half-baked (adjective)
  • senseless,
  • slow,
  • dumb.
  •idiotic (adjective)
  • unintelligent,
  • thick-witted.
  •ignorant (adjective)
  • nescient,
  • shallow,
  • obtuse,
  • thick,
  • unscholarly,
  • uninstructed.
  •lightheaded (adjective)
  • light-headed.

• Other synonyms:

  •
  • featherbrained,
  • gaga.
  •
  • flighty,
  • frivolous,
  • empty-headed.
  •
  • harebrained.
  •
  • frothy,
  • lighthearted.
  •
  • giddy.
  •
  • dizzy.
  •Other relevant words:
  • fluffy,
  • ditzy,
  • superficial,
  • lamebrain,
  • dim,
  • ability,
  • slow-witted,
  • light-minded,
  • brain dead,
  • futile,
  • lunkheaded,
  • Fiendly,
  • doltish,
  • gormless,
  • dim-witted,
  • Weak-minded,
  • soft,
  • goofy,
  • bonehead,
  • babyish,
  • Chuckleheaded,
  • yeasty,
  • softheaded,
  • thickheaded,
  • unsmart,
  • knuckleheaded,
  • pinheaded,
  • opaque,
  • oafish,
  • unprofound,
  • dorky,
  • half-witted,
  • dunderheaded,
  • dopey.

Antonyms for Birdbrained:

• adj.

  • fatuous
    aware, intelligent, bright, keen, smart, sensible.
  • flighty
    responsible, steady.
  • half-baked
    thoughtful, wise.
  • idiotic
    brainy, careful, serious, reasonable, balanced, cautious, sane.
  • ignorant
    experienced, competent, literate, talented, learned, educated, taught, knowledgeable.
  • lightheaded
    gloomy, miserable.
  • retarded
    clear, active, cognizant, light, quick.
  • vacuous
    filled, full.
  • Other antonyms:
    foxy, astute, sober, rational, crafty, fast, clever, logical, savvy, wily, shrewd, thinking, nimble, sage, sapient, judicious, highbrow, hyperintelligent, intellectual, staid, acute, earnest, sedate, dignified, sharp, prudent, quick-witted, ultrasmart, trained, brilliant, perspicacious, heavy, erudite, supersmart, resourceful, apt, melancholy, grave, perceptive, sagacious, severe, discerning, insightful, knowing, informed, sound, no-nonsense, skilled, Sharp-witted, percipient, well-read, valid, schooled, cerebral, scholarly, solemn, cunning, somber, ingenious.