unmanlike

It must be owned, however, that when a moment later the sound of muffled voices became audible down the stairs, he trembled extremely, and was guilty of the unmanlike act of hiding behind the curtain.

For the said dale, which hight the Black Valley of the Greywethers, hath a bad name for the haunting of unmanlike wights, against which even our men-at-arms might make no defence. 

A man—or a boy!—always hates to be intruding his own convictions upon other men, especially in a case like this, where he might be afraid of some idiot's thinking him unmanlike.