indiscernible
From Longman Dictionary of Contemporary Englishindiscerniblein‧dis‧cer‧ni‧ble /ˌɪndɪˈsɜːnəbəl◂ $ -ɜːr-/ adjective CLEAR/EASY TO SEEvery difficult to see, hear, or notice The path was almost indiscernible in the mist.Examples from the Corpusindiscernible• The crack in the windshield was almost indiscernible.• Her nod was indiscernible, with no appeal as to what and whom Ezra wanted to talk about.