indistinguishable

US /ˌɪndɪˈstɪŋɡwɪʃəbəl/

UK /ˌɪndɪˈstɪŋgwɪʃəbl/

B1
adj.AdjectiveExactly alike; not able to be seen as different
The twins were indistinguishable because of their matching clothes

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