(un-, prefix1 affix 6).

Want of consideration; failure or refusal to consider; thoughtlessness of action; indiscretion.

Want of consideration; inconsiderateness.

The quality of being inconsiderate; thoughtlessness, want of consideration; imprudence, rashness; an instance of this.

= main sense.

Want of thought or reflection; thoughtlessness, heedlessness, negligence; inadvertence.

Thoughtlessness, ignorance, uncouthness.

The quality or state of being thoughtless (in various senses); lack of thought or consideration; carelessness, inconsiderateness; absence of…

Want of deliberation or forethought.

Want of thought; = incogitancy, n.

Levity, thoughtlessness. Obsolete. rare.

Inconsiderateness.

Thoughtlessness, carelessness. Also: a thoughtless act, a blunder.

The quality, fact, or condition of being slobbery (in various senses).