moving slightly from side to side, as if you might fall: She's been in bed with flu, and she's still a little unsteady on her feet. likely to change, in a way that is worrying: The report showed unemployment surging in an already unsteady economy.

From Longman Dictionary of Contemporary English un‧stead‧y /ʌnˈstedi/ adjective 1 shaking or moving in a way you cannot control He poured the coffee with a very unsteady hand. a baby’s first unsteady steps She was quite unsteady on her feet (=she might fall over). 2 showing that you are nervous Her voice was unsteady.