in ‧ cred ‧ i ‧ bly S3 /ɪnˈkredəbli, ɪnˈkredɪbli/ BrE AmE adverb
[ Word Family: adverb : ↑ incredibly , ↑ credibly , ↑ incredulously ; adjective : ↑ incredible , ↑ credible , ↑ incredulous ; noun : ↑ credibility , ↑ incredulity ]
1 . [+adjective/adverb] informal extremely:
Nicotine is incredibly addictive.
2 . [sentence adverb] in a way that is hard to believe:
The knife had pierced his heart, but incredibly he was still alive.