空そら証しょう文もんMeaningsNoun1. empty promiseOther readings空から証しょう文もんKanji used空empty air証proof文written sentenceComposed of空そらsky; the air; the heavens; weather; far-off place; distant place; state of mind; feeling; (from) memory; (by) heart; …Noun証しょう文もんbond; deed; contractNoun