Incautious, a.
Etymology: [Pref. in- not + cautious: cf. L. incautus.]
Not cautious; not circumspect; not attending to the circumstances on which safety and interest depend; heedless; careless; as, an incautious step; an incautious remark.
You . . . incautious tread On fire with faithless embers overspread. Francis. His rhetorical expressions may easily captivate any incautious reader. Keill.
Syn. -- Unwary; indiscreet; inconsiderate; imprudent; impolitic; careless; heedless; thoughtless. -- In*cau"tious*ly, adv. -- In*cau"tious*ness, n.
Shades of meaning
Fernald lists incautious only as an antonym, under vigilant.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given