Adjective
The word is derived from clumsy
The people who lie the most are nearly always the clumsiest at it, and they're easier to fool with lies than most people, too. You'd think they'd be on the look-out for lies, but they seem to be the very ones that will believe almost anything at all. Dashiell Hammett
things which in my mind blossom will stumble beneath a clumsiest disguise appear capable of fragility and indecision. E. E. Cummings