unassailable

Meanings

immune to attack; incapable of being tampered with
impossible to assail
without flaws or loopholes

Synonyms

bulletproof, impregnable, inviolable, secure, strong, unattackable, unshakable, untouchable, watertight

Scrabble Score: 14

unassailable is a valid Scrabble (US) TWL word
unassailable is a valid Scrabble Word in Merriam-Webster MW Dictionary
unassailable is a valid Scrabble Word in International Collins CSW Dictionary

Words With Friends Score: 19

unassailable is a valid Words With Friends word