inconstant
adjective
[ ɪnˈkɒnst(ə)nt ]
• frequently changing; variable or irregular.
• "the exact dimensions aren't easily measured since they are inconstant"
Similar:
variable,
varying,
changeable,
changing,
irregular,
shifting,
fluctuating,
inconsistent,
not constant,
unsettled,
unfixed,
mutable,
unstable,
unsteady,
peaky,
labile,
changeful,
fluctuant,
variational,
Origin:
late Middle English: via Old French from Latin inconstant-, from in- ‘not’ + constant- ‘standing firm’ (see constant).