Meaning : To a high degree or extent. Favorably or with much respect.
Example :
Highly successful.
He spoke highly of her.
Does not think highly of his writing.
Extremely interesting.
Synonyms : highly
Meaning : To an extreme degree.
Example :
Extremely cold.
Extremely unpleasant.
She is super smart.
The night was deathly cold.
As a child, I was deathly afraid of snakes.
Synonyms : deathly, exceedingly, super
Extremely meaning in Bengali (Bangla).