Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

Q: unflappalbe, refreshing, funny, cool, confident

A: refreshing
****
Q: run, exercise, fall, drop, leaves

A: leaves
****
Q: up, descending, down, lower, melancholy

A:
melancholy
****