1) American young adult novel 2) French word used in English 3) Indefensible 4) Insupportable 5) Not excusable 6) Unjustifiable 7) Unpardonable 8) Unwarrantable 9) Unwarranted 1) Awful 2) Indefensible 3) Insupportable 4) Regrettable 5) Unexcusable 6) Unforgivable 7) Unfounded 8) Unjustifiable 9) Unpardonable 10) Unwarrantable 11) Unwarranted 
• (a.) Not excusable; not admitting excuse or justification; as, inexcusable folly.
In`ex·cus'a·ble adjective [ Latin inexcusabilis : confer French inexcusable . See Excuse .] Not excusable; not admitting excuse or justification; as, inexcusable folly. « Therefore thou art inexcusable , O man, whosoever thou art that judgest; for wherein tho...
[adj] - without excuse or justification 2. [adj] - not excusable
unforgivable adjective not excusable
incapable of being excused or justified.