on·er·ous (nr-s, nr-)
adj.
1. Troublesome or oppressive; burdensome. See Synonyms at burdensome.
2. Law Entailing obligations that exceed advantages.
ar·du·ous (ärj-s)
adj.
1. Demanding great effort or labor; difficult: "the arduous work of preparing a Dictionary of the English Language" Thomas Macaulay.
2. Testing severely the powers of endurance; strenuous: a long, arduous, and exhausting war.
3. Hard to traverse, climb, or surmount. See Synonyms at burdensome, hard.
Don't think it's either!
Lets create a new word......"Damageable"