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The Collaborative International Dictionary
Infaust

Infaust \In*faust"\, a. [L. infaustus; pref. in- not + faustus fortunate, lucky.] Not favorable; unlucky; unpropitious; sinister. [R.]
--Ld. Lytton.

Wiktionary
infaust

a. (context archaic English) unlucky, unfortunate, ill-omened; unpropitious; sinister