Synonyms and related words :
desireless, humble, inappetent, loveless, meek, modest, nirvanic, passionless, unambitious, unassuming, unattracted, unboastful, undesirous, uneager, unenthusiastic, unimposing, unobtrusive, unostentatious, unpresuming, unpresumptuous, unpretending, unpretentious