Sudden, unexpected.

Of actions, events, conditions: Happening or coming without warning or premonition; taking place or appearing all at once.

That occurs or manifests suddenly or in haste; (of an opinion, thought, etc.) hastily constructed; lacking due consideration; hasty, rash. Cf. subita…

That occurs or is manifested suddenly; rapid, sudden, hasty. Cf. subitaneous, adj. 1.

That makes a leap or other sudden movement; characterized by such movements; †bounding, full of energy (obsolete); impulsive, nervous; bursting forth.

figurative. Piercing; overwhelming, overpowering; wild, impetuous. Obsolete.

Esp. of change or movement: occurring suddenly, unexpectedly, or without warning; sharp; precipitate, hasty. In later use also: characterized by…

= subitaneous, adj. 1.

That occurs or is manifested suddenly, spontaneously, or in haste; sudden, hasty, unexpected; (also) hastily produced or constructed; makeshift. Now…

Coming upon one unexpectedly; taking unawares; capturing by sudden attack; also, †overpowering.

= subite, adj.

Arising out of the moment; casual, occasional; sudden, unprepared for. Now only of personal actions (cf. A. 2).

Arising at the moment, occasional, casual; sudden, unexpected. Obsolete.