1 imperfection, flaw, defect, blemish, deficiency, shortcoming, failing, weakness; frailty, foible, peccadillo:
The fault lies in this circuit. Using filthy language is only one of his faults.
2 mistake, error, blunder, lapse, failure, offence, oversight, slip(-up), indiscretion, gaffe, gaucherie, faux pas, Slang boner, howler, goof, boo-boo, Brit boob:
People should be responsible for their faults. There are many faults in this manuscript.
3 responsibility, liability, culpability; blame, accountability, answerability:
It wasn't my fault that the tree fell down. The fault lies with you, James.
4 sin, transgression, trespass, misdeed, offence, misdemeanour, vice, indiscretion, misconduct, misbehaviour:
He will confess his faults to anyone who will listen.
5 at fault. to blame, blameable, blameworthy, in the wrong, responsible, answerable, accountable, liable, culpable, guilty:
You were at fault for failing to report the crime.
6 find fault. criticize, censure, take exception (to), carp (at), cavil (at), pick at, pick on, pick apart, pick holes in, niggle, fuss, Colloq nit-pick, knock:
She constantly finds fault with everything I do.
7 to a fault. excessively, extremely, to an extreme, in the extreme, unreasonably, exceedingly, unduly, disproportionately, immoderately, irrationally, US overly:
She is modest to a fault.
8 find fault with, censure, blame, criticize, call to account, impugn, call into question, hold (someone) responsible or accountable or to blame, lay at (someone's) door, accuse:
You cannot be faulted for not knowing the fuel tank was empty.