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Definition of vacuity : 1. Space unfilled or unoccupied, or occupied with an invisible fluid only; emptiness; void; vacuum.
2. The quality or state of being vacuous, or not filled; emptiness; vacancy; as, vacuity of mind; vacuity of countenance.
3. Want of reality; inanity; nihility.

Synonyms:

rashness, hollowness, stupidity, pointlessness, vacuum, heedlessness, vacuum cleaner, hole, pocket, senselessness, convex, full, hollow, disinterest, disregard, cavity

absence (part of speech: noun)

lack, truancy, absence, want, omission, emptiness, abstraction, void, nonexistence, vacancy

thoughtlessness (part of speech: noun)

fatuity, inanity, brainlessness, blankness, mindlessness, unreasonableness, thoughtlessness

unsubstantiality (part of speech: noun)

cipher, spectre, insignificance, tenuousness, zero, apparition, ethereality, nothingness, phantom, unreality, nihility, intangibility, nullity, immateriality, impalpability, mirage

nonexistence (part of speech: noun)

nonentity, nil, null, vacuousness, naught, non-subsistence, meaninglessness, barrenness

Usage examples: