unshakable 2adjectivedomain: all adjPrinceton WordNet [ver.3.1]EnglishDefinitionwithout flaws or loopholesReport errorPath to highest hypernymMorphologySynset graphExamples1.a bulletproof argument2.an ironclad contract3.a watertight alibiSynonymsunassailable 3watertight 2bulletproof 1