in ‧ dis ‧ cer ‧ ni ‧ ble /ˌɪndɪˈsɜːnəb ə l◂, ˌɪndɪˈsɜːnɪb ə l◂ $ -ɜːr-/ BrE AmE adjective
very difficult to see, hear, or notice:
The path was almost indiscernible in the mist.
in ‧ dis ‧ cer ‧ ni ‧ ble /ˌɪndɪˈsɜːnəb ə l◂, ˌɪndɪˈsɜːnɪb ə l◂ $ -ɜːr-/ BrE AmE adjective
very difficult to see, hear, or notice:
The path was almost indiscernible in the mist.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012