Replace the expression in italics with one suitable word that conveys the same meaning.
He was taken aback by her sudden announcement.
He was surprised by her sudden announcement.
Complete the following task based on the instruction and optional input provided.### Instruction:
Replace the expression in italics with one suitable word that conveys the same meaning.

### Input:
He was taken aback by her sudden announcement.

### Output:
He was surprised by her sudden announcement.