Antonyms of adj dangerous

2 senses of dangerous

Sense 1
dangerous (vs. safe), unsafe -- (involving or causing danger or risk; liable to hurt or harm; "a dangerous criminal"; "a dangerous bridge"; "unemployment reached dangerous proportions")

safe (vs. dangerous) -- (free from danger or the risk of harm; "a safe trip"; "you will be safe here"; "a safe place"; "a safe bet")
        => fail-safe -- (eliminating danger by compensating automatically for a failure or malfunction; "a fail-safe device in a nuclear weapon to deactivate it automatically in the event of accident")
        => off the hook (predicate) -- (freed from danger or blame or obligation; "I let him off the hook with a mild reprimand")
        => risk-free, riskless, unhazardous -- (thought to be devoid of risk)
        => safe and sound, unhurt -- (free from danger or injury; "the children were found safe and sound")

Sense 2
dangerous, grave, grievous, serious, severe, life-threatening -- (causing fear or anxiety by threatening great harm; "a dangerous operation"; "a grave situation"; "a grave illness"; "grievous bodily harm"; "a serious wound"; "a serious turn of events"; "a severe case of pneumonia"; "a life-threatening disease")

INDIRECT (VIA critical) -> noncritical, noncrucial -- (not in a state of crisis or emergency)

Similarity of adj dangerous

2 senses of dangerous

Sense 1
dangerous (vs. safe), unsafe -- (involving or causing danger or risk; liable to hurt or harm; "a dangerous criminal"; "a dangerous bridge"; "unemployment reached dangerous proportions")
       => breakneck -- (moving at very high speed; "a breakneck pace")
       => chancy, chanceful, dicey, dodgy -- (of uncertain outcome; especially fraught with risk; "an extremely dicey future on a brave new world of liquid nitrogen, tar, and smog"- New Yorker)
       => desperate -- ((of persons) dangerously reckless or violent as from urgency or despair; "a desperate criminal"; "taken hostage of desperate men")
       => hazardous, risky, wild -- (involving risk or danger; "skydiving is a hazardous sport"; "extremely risky going out in the tide and fog"; "a wild financial scheme")
       => insidious -- (intended to entrap)
       => mordacious -- (biting or given to biting; "they deliberately gave me a skittish and mordacious mount")
       => on the hook (predicate) -- (caught in a difficult or dangerous situation; "there I was back on the hook")
       => parlous, perilous, precarious, touch-and-go -- (fraught with danger; "dangerous waters"; "a parlous journey on stormy seas"; "a perilous voyage across the Atlantic in a small boat"; "the precarious life of an undersea diver"; "dangerous surgery followed by a touch-and-go recovery")
       => self-destructive, suicidal -- (dangerous to yourself or your interests; "suicidal impulses"; "a suicidal corporate takeover strategy"; "a kamikaze pilot")
       => treacherous, unreliable -- (dangerously unstable and unpredictable; "treacherous winding roads"; "an unreliable trestle")
          Also See-> insecure#2, unsafe#1; vulnerable#1

Sense 2
dangerous, grave, grievous, serious, severe, life-threatening -- (causing fear or anxiety by threatening great harm; "a dangerous operation"; "a grave situation"; "a grave illness"; "grievous bodily harm"; "a serious wound"; "a serious turn of events"; "a severe case of pneumonia"; "a life-threatening disease")
       => critical (vs. noncritical) -- (being in or verging on a state of crisis or emergency; "a critical shortage of food"; "a critical illness"; "an illness at the critical stage")