Adverb
In an extreme manner or state; in the utmost degree; to the utmost point; exceedingly; as, extremely hot or cold.
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
highly successful Source: Internet