adj founded on presumption; as, a presumptuous idea.
2. presumptuous ·adj done with hold design, rash confidence, or in violation of known duty; willful.
3. presumptuous ·adj full of presumption; presuming; overconfident or venturesome; audacious; rash; taking liberties unduly; arrogant; insolent; as, a presumptuous commander; presumptuous conduct.