(adv) in an unwarrantable manner or to an unwarranted degree, Example:in this painting, the relationship of the upper part of the body to the lower is uneasy and the right thigh seems unwarrantably stressed
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
a. Not warrantable; indefensible; not vindicable; not justifiable; illegal; unjust; improper. -- Un*war"rant*a*ble*ness, n. -- Un*war"rant*a*bly, adv. [ 1913 Webster ]