ir·ra·tion·al·ism 
(ĭ-răshə-nə-lĭz′əm)
(ĭ-răshə-nə-lĭz′əm)n.
1. Irrational thought, expression, or behavior; irrationality.
2. Belief in feeling, instinct, or other nonrational forces rather than reason.
- in the offing
- in the public eye
- in the raw
- in the round
- in the running
- in the saddle
- in the same boat
- in the same breath
- in the short run
- in the soup
- in the street
- in the sun
- in the swim
- in the tank
- in the teeth of
- in the wake of
- in the way
- in the wind
- in the wings
- in the works
- in the world
- in the worst way
- in the zone
- intifada
- intima