#1
unassailable s. [
impregnable, inviolable, secure, strong, unattackable] immune to attack; incapable of being tampered with; "an impregnable fortress"; "fortifications that made the frontier inviolable"; "a secure telephone connection"
. wn #2
unassailable s. [
untouchable] impossible to assail
. wn #3
unassailable s. [
unshakable, watertight, bulletproof] without flaws or loopholes; "an ironclad contract"; "a watertight alibi"; "a bulletproof argument"
. wn