Definitions

1. adjective

having or characterized by a sing-song quality or rhythm; excessively sentimental or insincerely affectionate

“The teacher’s singsongy tone made the lecture feel like a nursery rhyme.”

2. noun

a quality of singing or speaking with a repetitive, rhythmical, and often insincerely affectionate tone

“The singsongy in her voice was off-putting and made it difficult to take her seriously.”