出典:Wiktionary
From smack + -less. Compare Middle English smakkeles, smechles (“savourless; lacking appeal または gusto”), West Frisian smakeleas (“tasteless”), Dutch smakeloos, smaakloos (“tasteless”), German geschmacklos (“tasteless”), Danish smagløs (“tasteless”), Swedish smaklös (“tasteless”), Icelandic smekklaus (“tasteless; indecent”).
smackless (comparative more smackless, superlative most smackless)