dangerous

Synonyms:

unsafe

insecure

lacking in security or safety

vulnerable

susceptible to attack

breakneck

moving at very high speed

chanceful, chancy, dicey, dodgy

of uncertain outcome; especially fraught with risk

desperate

(of persons) dangerously reckless or violent as from urgency or despair

hazardous, risky, wild

involving risk or danger

insidious

intended to entrap

mordacious

biting or given to biting

on the hook

caught in a difficult or dangerous situation

parlous, perilous, precarious, touch-and-go

fraught with danger

self-destructive, suicidal

dangerous to yourself or your interests

treacherous, unreliable

dangerously unstable and unpredictable

Antonyms:

safe

free from danger or the risk of harm

harmless

not causing or capable of causing harm

uninjured

not injured physically or mentally

secure

free from danger or risk

invulnerable

immune to attack; impregnable

fail-safe

eliminating danger by compensating automatically for a failure or malfunction

off the hook

freed from danger or blame or obligation

risk-free, riskless, unhazardous

thought to be devoid of risk

safe and sound, unhurt

free from danger or injury

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Synonyms:

grave, grievous, life-threatening, serious, severe

critical

being in or verging on a state of crisis or emergency