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: forward, opposite of up, unhappy, downward, down

A: unhappy
****
Q: level, flat, apartment, squashed, lined

A: lined
****
Q: slow, neighboring, locked, close, steady

A:
neighboring
****