Disregard, n.
The act of disregarding, or the state of being disregarded; intentional neglect; omission of notice; want of attention; slight. The disregard of experience. Whewell.
1 other Webster entry under this spelling
Disregard, v. t. [imp. & p. p. Disregarded; p. pr. & vb. n. Disregarding.]
Not to regard; to pay no heed to; to omit to take notice of; to neglect to observe; to slight as unworthy of regard or notice; as, to disregard the admonitions of conscience. Studious of good, man disregarded fame. Blackmore.
Shades of meaning
Fernald has no entry of its own for disregard; he lists it under neglect.
He lists it without comment; the entries above explain its neighbors.