sweet nothings
US /ˈswiːt ˈnʌθɪŋz/
UK /ˈswiːt ˈnʌθɪŋz/

1.
romantic or affectionate words, often insincere or meaningless, whispered to a lover
:
•
He whispered sweet nothings into her ear, making her blush.
•
Their conversation was mostly sweet nothings and laughter.