Enter a clue or pattern or both:
The Clue
Effective (7 letter answer)
The Answer
OPERANT
Tags
Notes
The answer OPERANT is so rare that it appears less than once every 2900 puzzles.
Related Clues
At work
Having an effect
Producing an effect
Definition
OPERANT as an adjective:
1. having influence or producing an effect; "many emotional determinants at work"; "an operant conscience"