OMINOUS, OMINOUSLY
ADJECTIVES
► FATAL foreboding or indicating mischief; ominous → 1590 obs.
► ORACULAR of mysterious portent; ominous, portentous → 1820
► UNCANNIE weird, mysterious, ominous, spooky, eerie, esp. of things → 1819 Sc.
► UNSONSY unlucky, unfortunate; ominous, fatal, causing ill-luck or misfortune → 1684 Sc. & Eng. dial.
ADVERBS
► SINISTERLY in an inauspicious or unlucky manner; unfortunately; ominously → 1465
VERBS
► ABODE to be ominous → 1659 obs.
Lexicophilia 