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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clue for "UNSTABLE"

UNSTABLE: Not fixed; Shaky; Not firmly fixed; Apt to topple; Tottering; Subject to change.; Variable.; Fickle; Like nitroglycerin; Volatile; Like radioactive isotopes; A home for a horse?