plaguey

adjective

1. such as to plague, torment, or annoy; vexatious: a plaguy pile of debts.

adverb

2. vexatiously or excessively: The room is plaguy hot.

adjective

1. disagreeable or vexing

adverb

2. disagreeably or annoyingly

adj.1570s, “pertaining to a plague,” from plague (n.) + -y (2). Figurative meaning “vexatious” is from 1610s. As an adverb (properly it would be plaguily) it is attested from 1580s, often with deliberate attempt at humor.