presumptuous

a. [ L. praesumptuosus: cf. F. présomptueux, OF. also presumptuous. See Presumption. ] 1. Full of presumption; presuming; overconfident or venturesome; audacious; rash; taking liberties unduly; arrogant; insolent; as, a presumptuous commander; presumptuous conduct. [ 1913 Webster ]

A class of presumptuous men, whom age has not made cautious, nor adversity wise. Buckminster. [ 1913 Webster ]

2. Founded on presumption; as, a presumptuous idea. “False, presumptuous hope.” Milton. [ 1913 Webster ]

3. Done with hold design, rash confidence, or in violation of known duty; willful. “Keep back the servant also from presumptuous sins.” Ps. xix. 13. [ 1913 Webster ]

Syn. -- Overconfident; foolhardy; rash; presuming; forward; arrogant; insolent. [ 1913 Webster ]