Tell me the synonyms of 'flabbergasted'.
Some synonyms for the word 'flabbergasted' are astonished, amazed, stunned, astounded, shocked, thunderstruck, dumbfounded, speechless, taken aback, dazed, bewildered, overwhelmed, and stupefied.
Complete the following task based on the instruction and optional input provided.### Instruction:
Tell me the synonyms of 'flabbergasted'.

### Output:
Some synonyms for the word 'flabbergasted' are astonished, amazed, stunned, astounded, shocked, thunderstruck, dumbfounded, speechless, taken aback, dazed, bewildered, overwhelmed, and stupefied.