Comparative form of unkind: more unkind (adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "unkinder" in a sentence
"Some will say I'm an alarmist, leftist, anti-technology and then proceed to unkinder labels."
"If you want to look like an error-riddled merchant (in the kindest interpretation) or a merchant who tries to sell things that don't exist to the gullible (in the unkinder one), that's your business."
"So Mrs. Eppingwell's thoughts of Freda were unkinder than ever."