unpardonably
1. [ adverb ] in an unpardonable manner or to an unpardonable degree
Synonyms: unforgivably inexcusably
Examples:

"he was inexcusably cruel to his wife"

Related terms: excusably excusably excusably inexcusable unpardonable inexcusable inexcusable inexcusable
Similar spelling:   unpardonable
  unbearably
  unbearable
  unprepared
  unapproachable