in‧cred‧i‧bly S3 / ɪnkredəbli, ɪnkredɪbli / 副词

1 [ + 形容词 / 副词 ] informal extremely :

Nicotine is incredibly addictive.

2 [句子副词] in a way that is hard to believe :

The knife had pierced his heart, but incredibly he was still alive.