prohibitively

/P R OW0 HH IH1 B AH0 T IH0 V L IY0/
adverb
  1. 1

    In a prohibitive manner.

  2. 2

    To a prohibitive extent.

    โ€œa prohibitively expensive giftโ€

Source: https://en.wiktionary.org/wiki/prohibitively