KEY: Grave.
SYN: Sad, serious, momentous, weighty, pressing, sedate, demure,thoughtful, sober, sombre, solemn, important, aggravated, heavy,cogent.
ANT: Joyous, merry, facetious, unimportant, ridiculous, trivial,light, frivolous, futile.

• irreligion, [See RELIGION]
• Irremediable, [See REMEDIABLE]
• Irremissible
• Irremovable
• Irreparable, [See REPARABLE]
• Irreprehensible, [See REPREHENSIBLE]
• Irrepressible
• Irreproachable, [See BLAMELESS]
• Irreprovable
• Irresistible, [See RESISTIBLE]
• Irresolute, [See RESOLUTE]
• Irrespective, [See RESPECTIVE]
• Irresponsible
• Irretrievable, [See RETRIEVABLE]
• Irreverence, [See REVERENCE]
• Irreversible, [See REVERSIBLE]
• Irrevocable, [See REVERSIBLE]
• Irrigate
• Irrigation, [See IRRIGATE]
• Irritable, [See HASTY]
• Irritant, [See TENTATIVE]
• Irritate
• Irritation, [See IRRITATE]
• Irruption
• Isolate