Definition of "unvaliant"

[…] and an unvaliant, impudent, affronted pleading for untruth, tyranny and wickednesse, which is neither a product of prudence, nor magnanimity.

1669, James Stewart, Jus Populi Vindicatum, or the People's Right, to defend themselves and their Covenanted Religion, vindicated

[…] and none but such as were unvaliant and despicable would long continue without the privilege of cutting their hair, after they had attained to years of maturity.

1777, Joseph Strutt, The Chronicle of England, volume 1

Even the unvaliant James would have dared to tackle him single-handed; but he represented the unknown and terrible majesty of the law.

1898, David Christie Murray, This Little World: A Novel, page 67

To those in the law enforcement community, the tape captured what they already believed: Marschke was weak-kneed or, at least, unvaliant.

1998, Alex Kotlowitz, The Other Side of the River, page 138