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someone who backs out at the last minute, doesn't show up, or just never hangs out enough. Can refer to the person or the action
Come out with us man, don't be a frail
Stokes always frails on us, don't even bother inviting him
by someonecoolerthanyou December 28, 2005
Someone lacking muscle bulk or definition.
Man, Brian is looking pretty frail today..
by wb2143 September 23, 2014