fluctuant
[adjective]
Synonyms: weak, dickey, insecure, rootless, shaky, unstable, unsure, vacillating, wavering, wobbly, uncertain, capricious, chancy, dicey, erratic, iffy, incalculable, unpredictable, whimsical

[TahlilGaran] English Synonym Dictionary ▲

fluctuant adjective. ['flʌktjʊǝnt] M16.
[Old & mod. French, pres. pple of Old French fluctuer from Latin fluctuare: see FLUCTUATE, -ANT¹.]
1. Moving like waves. Chiefly fig., unstable, wavering. M16.
■ R. L'Estrange How is it possible for any man to be at rest in this fluctuant wandering humour and opinion?

2. Floating (as) on waves; buoyant. rare. E17.
■ Bacon Fluctuant as the ark of Noah.

[TahlilGaran] English Dictionary ▲