Answer: Option A
Unsteady : liable to fall or shake; not steady in position.
Sensible : done or chosen in accordance with wisdom or prudence; likely to be of benefit.
Sensitive : quick to detect or respond to slight changes, signals, or influences.
Pensive : engaged in, involving, or reflecting deep or serious thought.
Groggy : dazed, weak, or unsteady, especially from illness, intoxication, sleep, or a blow.
Synonym of Groggy is Unsteady