Ant. Tough, rigid, inelastic, hard, inflexible, inexorable.
Flicker. Quiver, flutter, falter, waver, glimmer, bicker, shimmer, scintillate.
Ant. Stream, blase, beam, shine, gleam.
Flight. Flying, soaring, volitation, mounting, fleeing, departure; flock; volley, shower; escape, evasion, disappearance; stampede, hegira, exodus.
Ant. Recurrence, return, reappearance; repose, perching, alighting.
Flimsy. Gauzy, poor, transparent, thin; trifling, trivial, inane, puerile; weak, shallow, superficial, slight, unsubstantial; feeble, frivolous, foolish, light, trashy.
Ant. Solid, sound, irrefragable, cogent, substantial.
Flinch. Wince, swerve, recoil, blench, shrink, draw back.
Ant. Dare, face, bare, meet, endure, challenge, defy.
Fling. Throw, cast, toss, hurl, dart, pitch, chuck; prostrate, overthrow, throw down; wince, flounce; jeer, sneer, gibe, scoff, flaunt, taunt; emit, ejaculate.