Get the exact word from the text that means "to not be affected by an influence".
The student was immune to the external forces.
The word in the text that means "to not be affected by an influence" is "immune".
Complete the following task based on the instruction and optional input provided.### Instruction:
Get the exact word from the text that means "to not be affected by an influence".

### Input:
The student was immune to the external forces.

### Output:
The word in the text that means "to not be affected by an influence" is "immune".