phe ‧ nom ‧ e ‧ nal AC /fɪˈnɒmən ə l, fɪˈnɒmɪn ə l $ -ˈnɑː-/ BrE AmE adjective
very great or impressive:
the phenomenal success of computer games in recent years
phenomenal growth/rise/increase
California had experienced a phenomenal growth in population.
He has learned a phenomenal amount in the last two years.
The results have been phenomenal.
—phenomenally adverb :
The group have been phenomenally successful in Europe.