Filed from 4 published puzzles

ADAPTABLE

Set to 3 different clues across 4 published puzzles, most often “Not fixed” — The New York Times, Wednesday, 28 November 2007.

9 letters

Every clue on record, most used first

Not fixed2 times
The New York Times — Wednesday, 28 November 2007
Versatileonce
The New York Times — Saturday, 27 March 2010
Not limited to one useonce
The New York Times — Monday, 15 March 2004

Other answers to these clues

EVOLVING8 letters
FLUID5 letters
MOBILE6 letters
MOVABLE7 letters