This is the 6303rd most frequent Russian word.
усталости
The Russian word "усталости" means "fatigue" or "tiredness" in English.
Here, "усталости" refers to the general state of fatigue and is used in the plural genitive form, representing symptoms associated with this condition.
Симптомы усталости включают снижение концентрации и энергии.
Symptoms of fatigue include decreased concentration and energy.
The word "усталостью" is used in instrumental case here, showing how the individual confronted or managed fatigue by employing a specific method.
Он боролся с усталостью с помощью упражнений.
He fought fatigue with exercises.
In this sentence, "усталость" is used to describe the state of the person being physically and mentally tired due to a long day.