invulnerable

Something that's invulnerable is impossible to damage or injure, like the strongest, most rock solid concrete fort reinforced with steel bars. Or Mother Theresa's reputation.

From the Latin invulnerabilis, meaning “not wounding,” came the English invulnerable, an adjective meaning invincible or immune to attack. Some people look to vaccines to make them invulnerable. Others use body armor. Philosopher Henry David Thoreau, on the other hand, relied upon music: “When I hear music, I fear no danger. I am invulnerable."

Definitions of invulnerable
1

adj immune to attack; impregnable

“gunners raked the beach from invulnerable positions on the cliffs”
Synonyms:
unconquerable
not capable of being conquered or vanquished or overcome
protected
kept safe or defended from danger or injury or loss
safe
free from danger or the risk of harm
secure
free from danger or risk
air-tight, airtight
having no weak points
bombproof, shellproof
able to resist the explosive force of bombs and shells
defendable, defensible
capable of being defended
entrenched
dug in
impregnable, inviolable, secure, strong, unassailable, unattackable
immune to attack; incapable of being tampered with
tight
set so close together as to be invulnerable to penetration
sheltered
protected from danger or bad weather
untouchable
beyond the reach of criticism or attack or impeachment
Antonyms:
vulnerable
susceptible to attack
conquerable
subject to being conquered or overcome
unprotected
lacking protection or defense
dangerous, unsafe
involving or causing danger or risk; liable to hurt or harm
insecure, unsafe
lacking in security or safety
susceptible
(often followed by `of' or `to') yielding readily to or capable of
assailable, open, undefendable, undefended
not defended or capable of being defended
compromising
vulnerable to danger especially of discredit or suspicion
defenceless, defenseless
lacking protection or support
endangered
(of flora or fauna) in imminent danger of extinction
indefensible
not able to be protected against attack
insecure, unsafe
not safe from attack
penetrable
capable of being penetrated
threatened
(of flora or fauna) likely in the near future to become endangered
under attack, under fire
subjected to enemy attack or censure
unguarded
lacking protection or a guard
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