Find the word for a feeling of tiredness after doing a hard physical or mental effort.
The word you're looking for is fatigue. It describes the state of feeling tired, exhausted, or worn out due to strenuous physical or mental activity.
Complete the following task based on the instruction and optional input provided.### Instruction:
Find the word for a feeling of tiredness after doing a hard physical or mental effort.

### Output:
The word you're looking for is fatigue. It describes the state of feeling tired, exhausted, or worn out due to strenuous physical or mental activity.