Synonyms of prohibitively

1 Syllable

too

2 Syllables

over, parlous, quite, highly, ultra, plenty, very

3 Syllables

markedly, hugely, overmuch, notably, utterly, totally, rarely, awfully, almighty, powerful, terribly, violently, unduly, overly, mortally, vitally, strikingly

4 Syllables

uncommonly, immensely, exceedingly, remarkably, intensely, severely, surpassingly, acutely, extremely, drastically, unusually, radically

5 Syllables

terrifically, excessively, exorbitantly, exceptionally

6 Syllables

extraordinarily, inordinately, immoderately