an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a chattering or flighty, light-headed person.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
1520s, from L. diffidentia "want of confidence," from diffidere "to mistrust, lack confidence," from dis- "away" + fidere "to trust" (see faith). Modern sense is of "distrusting oneself" (1650s). The original sense was the opposite of confidence.