treacherousness en · NOUN
Etymology
Etymology tree English treacherous Proto-Germanic *-inōną Proto-Indo-European *-dyé- Proto-Germanic *-atjaną Proto-Indo-European *-tus Proto-Germanic *-þuz Proto-Germanic *-assuz Proto-Germanic *-inassuz Proto-West Germanic *-nassī Old English -nes Middle English -nesse English -ness English treacherousness From treacherous + -ness.
Meanings
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(uncountable) Treachery; the characteristic of being treacherous.
He had an aggressive treacherousness of eye which his potations had not subdued.
1901, Bret Harte, “Under the Eaves”, in Under the Redwoods:
Synonyms
treason · treachery · tergiversation · stab in the back · Judas kiss · perfidiousness · perfidiousness · traitory · breach of promise · treason · traitory · Punic faith · breach of trust · betrayal · swike · double-dealing · treacherousness · prodition · perfidy