Thwarting; contrary.

Of a sign, token, etc.: Of ill omen, ominous; hence, strongly indicative (of something unfavourable).

Of an omen or sign: portending or suggestive of misfortune or disaster; inauspicious, portentous.

poetic. In the works of Kenelm Henry Digby: that deviates or moves away from a path that leads to a central point (representing joy and heaven).