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Use "unsteadfast" in a sentence
"He looked a moment at his "unsteadfast footing," then let his gaze wander to the swirling water of the stream racing madly beneath his feet."
"Then I was angry and said in my heart -- The unsteadfast! they have verified the words of the"
"A strong nature boldly hurls his inkstand at the Devil's head; goes to battle with his opponents with words both written and spoken; and keeps his own individuality free from the perplexities with which opponents disturb all that has been previously done, and make the soul unsteadfast and unnerved for what is to come."