Definify.com

Webster 1913 Edition

Adj.

Unpropitious; unfavorable.

[Obs.]

“Dreams were impropitious.”

Sir H. Wotton.

Adj.

Not propitious; unpropitious.

[The latter is the word in use.]

impropitious ‎(comparative more impropitious, superlative most impropitious)

(obsolete) Not propitious; unfavourable.
Dreams were impropitious. — Sir H. Wotton.