恭謙[kyouken] modesty
謙虚[kenkyo] modesty
謙称[kenshou] refer to modestly
謙譲[kenjou] modesty
謙譲の美徳[kenjounobitoku] modest virtue

謙譲語[kenjougo] humble language (e.g. itadaku)
謙そん[kenson] humble
謙遜語[kensongo] humble language
謙る[herikudaru] to deprecate oneself and praise the listener
謙抑[kenyoku] humbling oneself