If something's off-putting, it annoys or disgusts you. A waiter's bad breath might be off-putting, and the high prices on the menu might be equally off-putting.
Off-putting things can seem unappealing, irritating, or downright horrifying. An off-putting movie trailer won't tempt you to see the film and an off-putting list of rules might keep you from signing up for a gym membership. In the sixteenth century, off-putting had a completely different meaning — basically "putting off," or "procrastinating." It wasn't until the late 1800s that it came to mean "creating an unfavorable impression."