considered opinion

It is my considered opinion that your time will be far more constructively spent if you devote it to helping your father.

It's my considered opinion that they were lost by human failure; the crewmen let the Piles get hot, and the ships were helpless.

If you want my considered opinion, our old friend Goble has asked for it and got it.

Mr. Mill found time for a “considered opinion,” of great elaboration and weight; it has been printed elsewhere.

"The drama represents her as a coquettish and reckless woman," was the considered opinion of one critic.