Enter a clue or pattern or both:
The Clue
Improbable (8 letter answer)
The Answer
UNLIKELY
Tags
Notes
The answer UNLIKELY is so rare that it appears less than once every 2500 puzzles.
Definition
UNLIKELY as an adjective:
1. (improbable, unlikely) = not likely to be true or to occur or to have occurred; "legislation on the question is highly unlikely"; "an improbable event"
2. has little chance of being the case or coming about; "an unlikely story"; "an unlikely candidate for reelection"; "a butcher is unlikely to preach vegetarianism"
3. (improbable, unbelievable, unconvincing, unlikely) = having a probability too low to inspire belief