mer·ri·ment 
(mĕrĭ-mənt)
(mĕrĭ-mənt)n.
High-spirited fun and enjoyment; hilarity.
- irreplaceable
- irreplaceableness
- irreplaceably
- irrepressibility
- irrepressible
- irrepressibleness
- irrepressibly
- irreproachability
- irreproachable
- irreproachableness
- irreproachably
- irresistibility
- irresistible
- irresistibleness
- irresistibly
- irresoluble
- irresolute
- irresolutely
- irresoluteness
- irresolution
- irresolvable
- irrespective of
- irrespirable
- irresponsibility
- irresponsible