Entry 1 sense Webster, 1913 Blackguardly · Black·guard·ly · IPA /ˈblæɡ.ɑːrd.li/ 01 adv. & a. In the manner of or resembling a blackguard; abusive; scurrilous; ruffianly. 1. In the manner of or resembling a blackguard; abusive; scurrilous; ruffianly.