Variable

1. Able to vary or be varied.
2. Likely to vary.
3. Marked by diversity or difference.
4. (mathematics) Having no fixed quantitative value.
5. (biology) Tending to deviate from a normal or recognized type.

Synonyms

• (able to vary): alterable, flexible, changeable, mutable
• (likely to vary): fickle, fluctuating, inconstant, shifting, unstable, unsteady
• (marked by diversity or difference): varying; heterogeneous
• (biology: tending to deviate from a normal or recognized type): aberrant

• capricious
• changeful
• mercurial
• mobile
• uncertain
• unequable
• unsettled

Antonyms

• (able to vary): constant, invariable, immutable, unalterable, unchangeable
• (likely to vary): constant, invariable, immutable, unchangeable steady or changeless
• (marked by diversity or difference): unchanging; homogeneous
• (mathematics: having no fixed quantitative value): constant, invariable