noun
Refers to something made up or not true; often used in contexts where someone is telling a story or excuse that is not based on reality.
彼の話は全部そらごとだった。
His story was all made up.
そんなそらごとを信じる人はいない。
No one believes such a fabrication.
Compound of 空 (そら, 'empty, sky') and 事 (こと, 'thing, matter'), literally 'empty matter'. The exact historical derivation is uncertain, but the spelling conventionally associates with something insubstantial or false.