This is the 17874th most frequent Russian word.
устал
"Tired."
Here, 'устал' describes a state of tiredness due to work. It is used as a past tense verb indicating the completion of getting tired.
Я устал от работы.
I am tired from work.
In this sentence, 'устал' is used to describe someone's apparent state of tiredness after an extended activity, suggesting observation.
Он кажется устал после долгой дороги.
He seems tired after a long journey.
This sentence shows 'устала', the feminine form of the word, used metaphorically to indicate emotional fatigue or weariness from repetition.