fearful, a. [apprehensive], alarmed, [afraid], frightened; [timid], timorous, [faint-hearted], [cowardly], [craven], [pusillanimous], [meticulous]; [terrible], [frightful], [dreadful], grim, [awful], dire, fell, [atrocious], [ghastly], terrifying, [alarming], appalling.
fearless, a. intrepid, [courageous], [bold], valorous, undaunted, [unafraid], [unflinching].
feasibility, n. [practicability].
feasible, a. practicable.
feast, n. [banquet], repast, [regale], Junket, festivity. Associated words: [convivial], conviviality.
feast, v. [banquet], [junket]; delight, [gratify].
feastful, a. [festive], festal.
feat, n. [exploit], [achievement], [stunt], [act], [deed].
feather, n. [plume], quill, [pinion].
feather, v. fledge.