I wrote Miss Crane off as mediocre because although she chatted quite pleasantly and intelligently over coffee she was mostly mumpchance at the dinner table. Oh, not mumpchance tout court.
{i} (Archaic) masquerade; person who just stands without saying anything (implying that he or she is not very bright)
mumchance
Heceleme
mum·chance
Telaffuz
Etimoloji
() From Middle English mommen (“mutter, be silent”) and Middle High German mummenschantze (“game of chance as part of a masquerade, mime performance, revel”) from Old French momen (“mask”) and cheance (“game of chance”)