very great in size, degree, amount, intensity, etc
That fire gives off a tremendous heat
informal
highly impressive, unusual, or exciting
We saw a tremendous film last night
great or extreme
You've been a tremendous comfort to me
archaic such as to arouse awe or fear
Probably its regular visitants, like the initiates of freemasonry, wished there were something a little more tremendous to keep to themselves about it — George Eliot
tremendously adv
tremendousness noun
[Latin tremendus, from tremere to tremble + -ous]