Replace the words in italics with another that has a similar meaning.
The teacher was obviously frustrated with the students' apathy.
The teacher was evidently irritated with the students' indifference.
Complete the following task based on the instruction and optional input provided.### Instruction:
Replace the words in italics with another that has a similar meaning.

### Input:
The teacher was obviously frustrated with the students' apathy.

### Output:
The teacher was evidently irritated with the students' indifference.