Adverb
To a very great degree; beyond what is usual; surpassingly. It signifies more than very.
Source: Webster's dictionaryextremely cold Source: Internet
extremely unpleasant Source: Internet
she is super smart Source: Internet
the night was deathly cold Source: Internet
as a child, I was deathly afraid of snakes Source: Internet
Accounts vary wildly with regard to this private incident and according to more modern sources, it is possible (but exceedingly convenient) that Claudius died of natural causes; Claudius was 63 years old. Source: Internet