This is the 5923rd most frequent Japanese word.
ものすごく
"ものすごく" means "extremely" or "incredibly."
ものすごく is used here to emphasize the extent of the heat, acting as an intensifier for the adjective '暑い' (hot).
去年の夏はものすごく暑かった。
Last summer was incredibly hot.
ものすごく emphasizes the degree of interest in his opinion, modifying '興味深い' (interesting).
彼の意見はものすごく興味深いと思った。
I thought his opinion was incredibly interesting.
ものすごく is used to highlight the emotional impact of the movie, intensifying '感動的' (touching).