feckless

adj. 没精神的,软弱的,无用的

fearlessness, fearsome, feasibility, feasible, feasibly, feast, feat, feather, feather bed, feather-bed, feather-brained, featherweight, feathery, feature, featureless, Feb, febrile, February, fecal, feces, fecklessly, fecklessness, fecund, fecundity, Fed, fed up, federal, federate, federation, fee, feeble, feeble-minded, feebleness, feebly, feed, feed in, feed on, feed up, feed with, feedback,