unthawing

/AH0 N TH AO1 IH0 NG/
verb
  1. 1

    To thaw out, to unfreeze; to become soft (of something which had been frozen).

adjective
  1. 1

    That does not thaw; eternally frozen.

Source: https://en.wiktionary.org/wiki/unthaw, https://en.wiktionary.org/wiki/unthawing