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Webster 1828 Edition

adv.

unsted'ily.

Without steadiness; in a wavering, vacillating manner.

Inconstantly; in a fickle manner.

Not in the same manner at different times; variously.

unsteadily ‎(comparative more unsteadily, superlative most unsteadily)

In an unsteady manner, so as to shake or falter.
He climbed the stairs unsteadily, grasping the banister and gasping for breath.
In an uncertain manner; with hesitation or timidity.
- 1912, Zane Grey, Riders of the Purple Sage, Chapter 21
  "I reckon. It's powerful fine to hear that," replied Lassiter, unsteadily.