Prudent
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hasty, idiotic, uncareful, unperceptive, untimely, inattentive, wasteful, expensive, obtuse, undiscriminating, unseasonable, inexpedient, careless, imprudent, thoughtless, unfeasible, brainless, nonsensical, rash, moronic, foolish, feebleminded, woodenheaded, unprofitable, profitless, stupid, purblind, uneconomical, inopportune, impractical, reckless, impolitic, incautious, heedless, indiscreet, unreasonable, unwise, imbecile.