Incorrupt, a.
Etymology: [L. incorruptus. See In- not, and Corrupt.]
1. Not affected with corruption or decay; unimpaired; not marred or spoiled.
2. Not defiled or depraved; pure; sound; untainted; above the influence of bribes; upright; honest. Milton. Your Christian principles . . . which will preserve you incorrupt as individuals. Bp. Hurd.
Shades of meaning
Fernald has no entry of its own for incorrupt; he lists it under pure.
He lists it without comment; the entries above explain its neighbors.