不自然な 〔自然に反する〕unnatural;〔人為的〕artificial;〔無理な〕forced, strained;〔気取った〕affected

    • 夫婦が別れて住むのは不自然だ
    • It is unnatural for a married couple to live separately.
    • 不自然な笑い
    • a forced smile
    • 彼は不自然な声で話す
    • He speaks in an affected voice.