Dirty, soiled or foul. / Not moral or chaste. / Ritually or ceremonially impure or unfit.

Absolute; without conditions, limitations, reservations or qualifications.

That which is not conditional. / (logic) A conditional-like structure expressing that the consequent holds true regardless of the particular value of the antecedent.

Not certain; unsure. / Not known for certain; questionable. / Not yet determined; undecided. / Variable and subject to change. / Fitful or unsteady. / Unpredictable or capricious.

(with "the") Something uncertain.

(US, idiomatic) To beg for mercy; to give up; to ask to stop (something painful or unbearable).

(colloquial, originally US) A personification of the United States federal government or (rare) citizens.

Alternative spelling of great-uncle

Alternative form of granduncle

(quantum mechanics) The Heisenberg uncertainty principle.