Here are some sentences.
She was insistent and he finally agreed to go.
He argued for burgers but she was insistent on seafood.
My sister is insistent when it comes to candy.
Liam was insistent on getting his toy back. Insistent means demanding, just thought I'd let you know :)
My sister is insistent when it comes to candy.
To be insistent is to demand an action. The child kept bothering the mother and was quite insistent until she answered him.
The suspect was insistent that the bag full of tools was not used for burglaring, but the police did not believe him.
The root word of "insistent" is "insist," which means to demand something firmly or persistently.
The girls didn't want to intrude by having dinner at Lily's, but Lily's family was insistent.
adament
A circle of police officers stood stupefied at his insistent denial of having seen anything of the incident.
what is a good sentence for the word opposite
A good sentence for the word baffled is:
Persistent, unyielding, inexorable, insistent