not firmly, not for certain
Он нетвердо стоял на ногах после болезни.
He was unsteady on his feet after his illness.
Том нетвёрдо стоя́л на нога́х. Он толком не поза́втракал.
Tom was unsteady on his feet. He hadn’t had a proper breakfast.
Я вы́пил слишком много и нетвёрдо держа́лся на нога́х.
I drank too much and was unsteady on my feet.
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