Antonyms for peril

danger, risk:

protection, safeness, security, certainty, safety.

noun:

harbor, invulnerability, refuge, safeguard, defense, immunity, asylum, preservation, haven, ward, salvation, secureness, exemption, impunity, shelter, guard, shield, retreat.

Paraphrases for Peril:

• Noun, singular or mass :
  alien, at-risk, calamity, cataclysm, catastrophe, challenge, challenges, chance, compromise, concern, conflagration, curse, danger, depletion, detriment, devastation, disadvantage, disaster, emergency, Endangerment, evil, expense, fear, funeral, gamble, harm, hazard, hazardous, holocaust, jeopardy, liability, likelihood, misery, misfortune, pitfall, plague, plight, possibility, potential, prejudice, probability, responsibility, risk, risk-taking, scourge, spectre, suffering, threat, threatened, tragedy, trouble, venture, verge.
• Proper noun, singular :
  danger, dangers, eternal, harm, hazard, hazardous, hazards, jeopardy, risk, threat, threatened.