1) Erratically 2) Falteringly 3) In an unsteady manner 4) Precariously 5) Treacherously 6) Uncertainly 7) Unevenly 8) With fluctuations 1) Falteringly 2) Insecurely 3) Randomly 4) Shakily 5) Tiredly 6) Uncertainly 
[adv] - in an unsteady manner
falteringly adverb in an unsteady manner; `he walked unsteadily toward the exit`; `The wounded soldier was swinging unsteadily on his legs`