blackguardize
/ˈblaɡɑːdʌɪz/ /ˈblaɡədʌɪz/(also blackguardise)
verb
[with object] To reduce to the condition of a blackguard; to characterize as a blackguard. Also without object: to behave as a blackguard.
Origin
Late 18th century; earliest use found in The Public Advertiser. From blackguard + -ize.