Webster's Revised Unabridged Dictionary · 1913

Parlous

Parlous , adjective

[For perlous, a contr. from perilous.]

1.
Attended with peril; dangerous; as, a parlous cough. [Archaic]
A parlous snuffing. — Beau. & Fl
2.
Venturesome; bold; mischievous; keen. [Obsolete]
A parlous boy. — Shakespeare
A parlous wit. — Dryden