Unconsidered, unwise.

Of things, actions, etc.: Not properly considered; done or made without deliberation; thoughtless, unadvised, precipitate, rash. (Now often…

(un-, prefix1 affix 1.)

Not deliberately considered; not pondered before utterance or expression; hasty, inconsiderate.

Not ordered in the mind; not thought out; ill-considered.

Not considered, unconsidered; = inconsiderate, adj. 1.

Inconsiderate, unadvised, unreflecting.

Of actions: Done without deliberation or forethought; not carefully considered or planned beforehand. Also of thoughts, words, etc…

= indeliberate, adj. 2.

= inconsiderate, adj. 1.

(un-, prefix1 affix 2.)