Enter a clue or pattern or both:
The Clue
Uncommon (10 letter answer)
The Answer
INFREQUENT
Tags
Notes
The answer INFREQUENT is so rare that it appears less than once every 2500 puzzles.
Definition
INFREQUENT as an adjective:
1. not frequent; not occurring regularly or at short intervals; "infrequent outbursts of temper"