from
The Collaborative International Dictionary of English v.0.48
Perilous \Per"il*ous\, a. [OF. perillous, perilleus, F.
p['e]rilleux, L. periculosus. See {Peril}.] [Written also
{perillous}.]
1. Full of, attended with, or involving, peril; dangerous;
hazardous; as, a perilous undertaking.
[1913 Webster]
Infamous hills, and sandy, perilous wilds. --Milton.
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2. Daring; reckless; dangerous. [Obs.] --Latimer.
[1913 Webster]
For I am perilous with knife in hand. --Chaucer.
[1913 Webster] -- {Per"il*ous*ly}, adv. --
{Per"il*ous*ness}, n.
[1913 Webster]