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Definition of perilous : 1. Daring; reckless; dangerous.
2. Full of, attended with, or involving, peril; dangerous; hazardous; as, a perilous undertaking.

Synonyms:

uncertain, equivocal, touch-and-go, parlous, shaky, dubious, chancy, unsteady, hairy, safety, venturesome, venturous, unassured, unstable, unsettled, doubtful, adventurous

disastrous, unlucky, burdensome, hard, grievous, unfortunate, difficult, calamitous, unfavorable, adverse, tragic, inauspicious, opposing, antipathetic, woeful, unpropitious, troublesome, untoward, miserable, detrimental, catastrophic, unfriendly, distressful

jeopardous, hazardous, treacherous, ominous, threatening, precarious, insecure, risky, menacing, dangerous, unsafe

Usage examples:

• To be astray in a wilderness of any kind is a perilous predicament for the traveller- in one without water it is death. - "The Lone Ranche", Captain Mayne Reid.
• The battle has been perilous. - "Charles Lamb", Barry Cornwall.
• You have heard my story, Jasper Pennington, he said- heard how I struck my wife when she was in a perilous condition. - "The Birthright", Joseph Hocking.