Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class I. Words Expressing Abstract Relations
Section VII. Change
2. Complex Change

149. Changeableness.

   NOUN:CHANGEABLENESS &c. adj.; mutability, inconstancy; versatility, mobility; instability, unstable equilibrium; vacillation (irresolution) [See Irresolution]; fluctuation, vicissitude; dysphoria; alternation (oscillation) [See Oscillation]; transientness [See Transience].
  [COMPARISONS] moon, Proteus, kaleidoscope, chameleon, quicksilver, shifting sands, weathercock, vane, weathervane, harlequin, turncoat, Vicar of Bray, Cynthia of the minute, April showers; wheel of Fortune.
  RESTLESSNESS &c. adj.; fidgets, disquiet; disquietude, inquietude; unrest; agitation [See Agitation].
   VERB:FLUCTUATE, vary, waver, flounder, flicker, flitter [archaic], flit, flutter, shift, shuffle, shake, totter, tremble, vacillate, wamble [dial.], turn and turn about, ring the changes; sway -, shift- to and fro; change and change about; oscillate [See Oscillation]; vibrate -, oscillate- between two extremes; alternate; have as many phases as the moon.
   ADJECTIVE:CHANGEABLE, changeful; changing [See Change]; mutable, variable, checkered, ever changing, kaleidoscopic; protean, proteiform; versatile.
  INCONSTANT, unstaid, unsteady, unstable, unfixed, unsettled; fluctuating &c. v.; restless, uneasy; agitated [See Agitation]; erratic, fickle; mercurial, irresolute [See Irresolution]; capricious [See Caprice]; touch and go; inconsonant, fitful, spasmodic; vibratory; vagrant, feathery [rare], light-headed, wayward; desultory; afloat; alternating; alterable, plastic, mobile; transient [See Transience]; wavering.
   ADVERB:SEESAW (oscillation) [See Oscillation]; off and on.
  1. A rolling stone gathers no moss.
  2. Pietra mossa non fa muschis.
  3. Honores mutant mores.
  4. Varium et mutabile semper femina.—Vergil