Definify.com

Webster 1913 Edition

Adj.

Full of change; mutable; inconstant; fickle; uncertain.

Pope.

–

Change′ful-ly

adv.

–

Change′ful-ness

Noun.

–

Change′less-ness

Noun.

Adj.

Full of change; inconstant; mutable; fickle; uncertain; subject to alteration.

changeful ‎(comparative more changeful, superlative most changeful)

(rare) Changing frequently; very susceptible to change; variable; fickle.
- 1606, William Shakespeare, Troilus and Cressida, act 4, scene 4, line 99:
  When we will tempt the frailty of our powers, presuming on their changeful potency.

changing frequently

Bulgarian: непостоянен (bg) ‎(nepostojanen), постоянно менящ се ‎(postojanno menjašt se)
Russian: изме́нчивый (ru) ‎(izménčivyj), непостоя́нный (ru) ‎(nepostojánnyj)

“changeful” in Dictionary.com Unabridged, v1.0.1, Lexico Publishing Group, 2006.
changeful in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913