Corrupted or filled with imperfections. / (computer security, of data) Originating from an untrusted source.

simple past tense and past participle of taint

Contraction of it ain't.

present participle of taint

A thrust with a lance, which fails of its intended effect.

(transitive) To damage, as a lance, without breaking it; also, to break, as a lance, but usually in an unknightly or unscientific manner. / (intransitive) To thrust ineffectually with a lance.

Alternative spelling of 'taint

(transitive) To contaminate or corrupt (something) with an external agent, either physically or morally. / (transitive) To spoil (food) by contamination.

A contamination, decay or putrefaction, especially in food. / A tinge, trace or touch. / A mark of disgrace, especially on one's character; blemish. / (obsolete) Tincture; hue; colour.

(US, slang) The perineum.