
Unlikely, but it could be a dwarf planet.
The Big Bang Theory Season 9, Episode 12

It's not terrific.
Lots of highly UNLIKELY things happen.
The Big Bang Theory Season 9, Episode 15

That's very UNLIKELY, Mrs. Koothrappali.
The Big Bang Theory Season 2, Episode 23

Seems UNLIKELY.
The Big Bang Theory Season 5, Episode 13

It says rabies in rabbits
is highly UNLIKELY.
The Big Bang Theory Season 9, Episode 15