Formality. Custom, established mode; ceremony, etiquette, conventionality, mere form; parade, affectation, punctiliousness, stateliness.
Ant. Informality; unceremoniousness, unconventionality; originality.
Formation. Creation, production; composition, constitution; arrangement, disposal, combination, disposition; construction, shape, structure.
Former. Anterior, antecedent, previous, prior, preceding, foregoing; quondam, late, old-time; past, bygone, foregone, previous; first-named, first-mentioned; earlier, ancient.
Ant. Subsequent, succeeding, posterior, latter, modern, coming, future.
Formidable. Terrible, redoubted, tremendous, dangerous; awful, alarming, terrifying, discouraging, appalling, serious, horrible, dreadful, fearful, shocking.
Ant. Light, trivial; feeble, harmless, contemptible, powerless, despicable, weak, helpless.
Forthwith. Instantly, directly, immediately, without delay, instantaneously.
Ant. Hereafter, soon, by-and-by, presently.
Fortification. Fort, stronghold, fortress, fastness, castle, citadel; bulwark, fortified place.