空から証しょう文もんMeaningsNoun1. empty promiseOther readings空そら証しょう文もんKanji used空empty air証proof文written sentenceComposed of空からemptiness; being empty; not carrying anything; unburdened; empty-handed; dishonoured (bill, promise, etc.); false; no-show (reservation); put-on (cheeriness, courage, etc.); empty (compliments); …Noun証しょう文もんbond; deed; contractNoun