unconstant (adj.)
changeable, fickle, unpredictable
3H6 V.i.102 [George to Richard] I will henceforth be no more unconstant
KJ III.i.243 [King Philip to Cardinal Pandulph, of breaking the treaty] Make such unconstant children of ourselves
KL I.i.299 [Regan to Gonerill, of Lear's behaviour] Such unconstant starts are we like to have from him

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