improvident

[Pref. im- not + provident: cf. L. improvidus. See Provident, and cf. Imprudent.]
Not provident; wanting foresight or forethought; not foreseeing or providing for the future; negligent; thoughtless; as, an improvident man.

Improvident soldiers! had your watch been good,
This sudden mischief never could have fallen.

Syn. -- Inconsiderable; negligent; careless; shiftless; prodigal; wasteful.