This is the 5997th most frequent Russian word.
слабый
Weak.
The word 'слабый' refers to physical weakness in the context of recovery from illness.
Он такой слабый после болезни.
He is so weak after the illness.
Here, 'слабый' describes the reduced strength or volume of the voice due to exertion.
У неё слабый голос после долгих репетиций.
She has a weak voice after lengthy rehearsals.
In this sentence, 'слабая' relates to the insufficient strength or durability of an object in an engineering context.