This is the 642nd most frequent Marathi word.
थक
Fatigue or tiredness.
Here, 'थक' refers to the state of being tired.
तुमच्या चेहऱ्यावर थक असल्याचे स्पष्ट दिसते.
It is evident from your face that you are tired.
In this sentence, 'थकले' (a derived form of 'थक') implies physical fatigue.
कठीण कामामुळे माझे शरीर थकले आहे.
Due to hard work, my body is fatigued.
In this context, 'थक' signifies an abstract concept of weariness.