IPA: /trɪˈmɛndəsli/
KK: /trɪˈmɛndəsli/
To a very great degree; extremely.
She was tremendously excited about her new job.
Tremendously → It is formed from "tremendus" (from Latin, meaning to be feared or dreadful) and the suffix "-ly" (meaning in a manner of). The word "tremendously" means in a manner that is very great or extreme, often evoking a sense of awe or fear.
Think of something that is 'dreadful' or 'to be feared' — that's what 'tremendously' conveys, describing something in an extreme or impressive way.