unfathomable. adjective. formal us / ʌnˈfæð.ə.mə.b ə l / uk / ʌnˈfæð.ə.mə.b ə l / Add to word list Add to word list. impossible to understand: For some unfathomable reason they built the bathroom next to the kitchen. SMART Vocabulary: related words and phrases. Difficult to understand. abstrusely. ambiguity. ambiguously. esoterically. fathomlessly. More @Wikipedia
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