Definitions for ill will
Random House Webster's College Dictionary
hostile feeling; enmity.
Origin of ill will:
hostility, enmity, ill will(noun)
the feeling of a hostile person
"he could no longer contain his hostility"
hostility, ill will(noun)
a hostile (very unfriendly) disposition
"he could not conceal his hostility"
Ill-disposed attitude; grudge; dislike.