No, it is not. It is an adverb, the adverb form of the adjective unsteady.
"Unsteadily" is an adverb, as it describes how an action is performed (in this case, "unsteadily" describes the manner in which something is done).
visa beaus solution more unsteadily
It means "stand" or "standing."in an unsteady manner; uncertainly"he walked unsteadily toward the exit"; "The wounded soldier was swinging unsteadily on his legs"
Headily, steadily, unsteadily,
shakily
To move or stand unsteadily
To move unsteadily from side to side
To stumble or go unsteadily. -(OED)
disjointedly, discontinuously, haphazardly, unsteadily.
Unsteadily is the adverb that means not in a steady way.
The correct spelling is to lurch (to move in uneven motion, or unsteadily)
The word flickered means to shine unsteadily or to make small, unsteady movements.