Ant. Common, trivial, superficial, vulgar, commonplace, conversational, colloquial, obvious.
Inert. Inactive, lifeless, dead, passive, motionless; dull, indolent, torpid, lazy, idle, supine, sluggish, slothful; heavy, dormant.
Ant. Active, alert, brisk, energetic, quick, vigorous.
Inevitable. Necessary, unavoidable, infallible, certain, fixed, irresistible.
Ant. Uncertain, avoidable, indeterminate.
Infamy. Dishonor, shame, disgrace, discredit, ignominy, opprobrium, scandal, obloquy, abasement; villainy, disgracefulness, wickedness, atrocity, shamefulness; despair, degradation.
Ant. Honor, reputation, renown, glory, celebrity.
Infantile. Young, childish, tender; babyish, weak; childlike, babylike; puerile, imbecile.
Ant. Manly, vigorous, mature, robust.
Infatuation. Folly, stupefaction, foolishness, prepossession, obsession; fatuity, hallucination, madness, self-deception.