a wrong opinion, idea or act because of wrong information, lack of ability or skill etc
error, misunderstanding
Cases of word usage
1) a foolish mistake (blunder)
2) (to make) a silly mistake (boob)
3) to use a situation, mistake etc to one's advantage or profit (capitalize)
4) a mistake in writing or printing (erratum)
5) (French) an accidental mistake in behaviour or speech that offends all people (faux pas)
6) of mistake (mistook)
7) (a mistake caused by) a disorganized state, confused arrangement etc (mixup)
8) about which no mistake or doubt is possible (unmistakable)