unattackable
Speech parts
1. unattackable - Adjective
2. unattackable - Adjective Satellite
Meaning
immune to attack; incapable of being tampered with
Source: WordNetSynonyms
strong
secure
impregnable
inviolable
unassailable
hard
absolute
safe
armored
impassable
invincible
dependable
impenetrable
invulnerable
indestructible
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Antonyms
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an impregnable fortress
fortifications that made the frontier inviolable
a secure telephone connection