Adverb: inexcusably ,i-nik'skyoo-zu-blee or ,i,nek'skyoo-zu-blee
- In an unpardonable manner or to an unpardonable degree
"he was inexcusably cruel to his wife";
- unpardonably, unforgivably
- Without any excuse
"he is inexcusably harsh on her";
- unjustifiably
Antonym: excusably, justifiably