KEY: Rollicking.
SYN: Roystering, frolicsome, hoydenish, blustering.
ANT: Staid, sedate, demure.

• Inconcinnity
• Inconclusive, [See CONCLUSIVE]
• Incongruous, [See CONGRUOUS]
• Inconsiderable, [See CONSIDERABLE]
• Inconsiderate, [See CONSIDERATE]
• Inconsistent, [See CONSISTENT]
• Inconsolable
• Inconsonant, [See CONSONANT]
• Inconstant
• Incontestable
• Incontiguous, [See ADJACENT_and_CONTERMINOUS]
• Incontinently, [See INCONTINENT]
• Incontinent, [See CONTINENCE]
• Incontrovertible, [See CONTROVERTIBLE]
• Inconvenience \v
• Inconvenient, [See CONVENIENT]
• Inconversible, [See AFFABLE]
• Inconvertible, [See CONVERTIBLE]
• Incorporal, [See CORPORAL]
• Incorporate, [See INTEGRATE]
• Incorrect, [See CORRECT]
• Incorrigible, [See CORRIGIBLE]
• Incorruptible, [See CORRUPT]
• Incrassate, [See THICKEN]
• Increase