An unfeminine female character looks like or is mistaken for a male. Sometimes this is to show that she's as tough as a guy, even One of the Boys, sometimes to show that she's a Butch Lesbian, but frequently just to show that she's (supposedly) unattractive. Often used for comedy, in which case she may be an Abhorrent Admirer. Supertrope of Bifauxnen, where a woman looks like a Pretty Boy, usually with fangirls (or fanboys) who take obvious notice.