I believed in it thoroughly because it is true, and I knew it.
As for Bliss, he was stanch; he believed in the book thoroughly, from every standpoint.
Yet he thoroughly believed in honesty and the like virtues.
They now thoroughly believed that he guarded a secret of the scientific laws of this cosmos which was vital to them.
Or perhaps he believed too thoroughly in his own tough-guy image.
I believed in Margaret's belief so thoroughly that it did not occur to me to dispute her reasoning.
"I thoroughly believe that is one of the last pristine parcels on the shoreline," she said.
"I thoroughly believe the only way we are going to make a difference in public policy is with a bipartisan approach," Ms. Birch said.
I thoroughly believe our players need to cope with these situations, to execute in those situations, if they're going to get to the next level.
She has inherited her slaves from her father and believes thoroughly in the institution of slavery.