| inappropriate |
| incredible(adjective, strange, fantasy, unreal) |
| insubstantial(adjective, strange, fantasy, unreal) |
| jocose(adjective, pleasant, happy, cheerful, jolly) |
| jocund(adjective, pleasant, happy, cheerful, jolly) |
| jokey(adjective, pleasant, happy, cheerful, jolly) |
| jolly(adjective, pleasant, happy, cheerful, cordial) |
| jollying(adjective, pleasant, happy, cheerful, jolly) |
| joshing(adjective, pleasant, happy, cheerful, jolly) |
| jovial(adjective, happy) |
| jubilant(adjective, pleasant, happy, cheerful, jolly) |
| larking(adjective, pleasant, happy, cheerful, jolly) |
| lighthearted(adjective, pleasant, happy, cheerful, jolly) |
| lots of laughs(expression, adjective, idiom, pleasant, happy) |
| madding(adjective, crazy, mad, odd, insane) |
| madman(adjective, crazy, mad, odd, insane) |
| maniacal |
| merry(adjective, pleasant, happy, cheerful, jolly) |
| meshuga |
| mirthful(adjective, pleasant, happy, cheerful, jolly) |