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Definition of vacuous:

  1. Empty; unfilled; void; vacant.

Synonyms:

lunkheaded, pinheaded, undiscriminating, impulsive, empty, unfilled, dumb, stark, dense, thick, airheaded, waste, empty-bellied, oafish, clean, mindless, shallow, dim-witted, dim, unsmart, inane, meaningless, untenanted, hasty, asinine, slow, dunderheaded, ill-considered, white, obtuse, simple, thick-witted, thickheaded, fatuous, soft, irresponsible, weak-minded, senseless, clear, bonehead, witless, reasonless, drained, dorky, full, lamebrain, boneheaded, half-witted, knuckleheaded, softheaded, brain-dead, unemployed, bubbleheaded, toom, birdbrained, bare, unintelligent, depleted, forgetful, chuckleheaded, opaque, leisure, doltish, gormless, impetuous, unmindful, foolish, hollow, dopey, slow-witted.

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