YOU SAID:
their skin tone is ambiguously ethnic
INTO JAPANESE
彼らの肌の色合いは曖昧にエスニックです
BACK INTO ENGLISH
Their skin tone is vaguely ethnic
INTO JAPANESE
彼らの肌の色合いは漠然と民族的です
BACK INTO ENGLISH
Their skin tone is vaguely ethnic
That didn't even make that much sense in English.