KEY: Sprightly.
SYN: Blithe, lively, gay, vivacious, alert, agile, brisk, animated.
ANT: Sombre, dull, lifeless, sluggish, inanimate, heavy.

• Inward
• Iota
• {[IQental]?}
• Irascible, [See HASTY_and_ANGRY]
• Irate, [See HASTY_and_ANGRY]
• Ire, [See WRATH]
• Iridescent
• Irk
• Ironical, [See IRONY]
• Irony
• Irradiate, [See ILLUMINATE]
• Irrational, [See RATIONAL]
• Irreclaimable, [See RECLAIMABLE]
• Irreconcilable, [See RECONCILABLE]
• Irrecoverable
• Irredeemable, [See REDEEMABLE]
• Irreducible
• Irrefragable, [See REFRAGABLE]
• Irrefutable, [See REFRAGABLE]
• Irregular, [See REGULAR]
• Irrelevant, [See RELEVANT]
• Irreligions
• irreligion, [See RELIGION]
• Irremediable, [See REMEDIABLE]
• Irremissible