syrupy
US /ˈsɪr.əp.i/
UK /ˈsɪr.əp.i/

1.
2.
(of a voice or manner) excessively sweet or sentimental
:
•
His syrupy voice made her cringe.
•
The actor delivered his lines with a syrupy, insincere tone.
(of a voice or manner) excessively sweet or sentimental