It's not terrific.
Lots of highly UNLIKELY things happen.
The Big Bang Theory Season 9, Episode 15
Yes, but it's highly UNLIKELY.
Game of Thrones Season 1, Episode 4
It says rabies in rabbits
is highly UNLIKELY.
The Big Bang Theory Season 9, Episode 15
That's what makes
their friendship UNLIKELY!
The Big Bang Theory Season 7, Episode 10
and able to anticipate your
actions, it is highly UNLIKELY
The Big Bang Theory Season 5, Episode 7