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Use "unconstant" in a sentence
"Unjust I may have been, weak and resentful I have been, but never unconstant."
"As for that which is subject to opinion, it is always unconstant, wandering, and carried away with several passions and changes, liable to diminution and increase, and to be variously disposed to various men, and not always appearing after one manner even to the same individual."
"Methinks, Diadumenus, I am this day become a various and unconstant man."