Save Gender Masculine Usage Japanese Scripts さだむ(Japanese Hiragana) 質, 莫, 成, 定, etc.(Japanese Kanji) Pronounced Pron. SAH-DAH-MOO [key] Meaning & History From Japanese 質 (sadamu) meaning "characteristic, content", 成 (sadamu) meaning "to become" or from 莫 (sadamu) meaning "late, end, may not, must not be". Other kanji or kanji combinations can be used.