unverifiable
un ver i fi a ble |ˌənverəˈfīəbəl ˌənvɛrəˈfaɪəbəl | ▶adjective not able to be verified: an unverifiable hypothesis.
un |veri ¦fi ¦able |ʌnˈvɛrɪfʌɪəb (ə )l | ▶adjective not able to be verified: an unverifiable hypothesis.