unfavorable or unfortunate

Untoward circumstances forced him into bankruptcy.

improper

untoward social behavior.

Archaic . froward; perverse.

adjective

auspicious , happy , lucky , acceptable , proper , suitable

adjective

adverse , annoying , awkward , contrary , disastrous , disturbing , fractious , hapless , ill-starred , inauspicious , inconvenient , indocile , inimical , inopportune , intractable , irritating , luckless , misfortunate , perverse , recalcitrant , refractory , star-crossed , undisciplined , unfavorable , unfortunate , ungovernable , unhappy , unlucky , unmanageable , unpliable , unpropitious , unruly , untimely , unyielding , vexatious , wild , improprietous , inappropriate , indecent , indecorous , indelicate , malodorous , out of place , rough * , unbecoming , uncouth , unfitting , ungodly * , unseemly , disadvantageous , negative , unadvantageous , unsatisfactory , ill-fated , disorderly , lawless , obstinate , obstreperous , uncontrollable , immodest , naughty , unbefitting , difficult , improper , troublesome