なめらかひさごでしょう
滑瓢でしょう
nameraka hisagodeshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of ぬらりひょん

1. Probably will slip.; Likely to fail.

Polite
Presumptive
Conjecture
Mythology
Usually Written in Kana