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The Collaborative International Dictionary of English v.0.48 (gcide)

Incautious \In*cau"tious\, a. [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.
[1913 Webster]

You . . . incautious tread
On fire with faithless embers overspread. --Francis.
[1913 Webster]

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.
[1913 Webster]