"thoroughly loved" is a correct and usable phrase in written English.
You can use it to indicate strong or complete feelings of love for someone or something, and it is usually used in the past tense. For example: I was thoroughly loved by my family growing up.
From Day 1, I have thoroughly loved my job.
I was hungry for the experience and thoroughly loved my job.
"I finally decided that if anything happened to Mark in space, at least he was doing something he thoroughly loved," she said.
"I now live near Peckham [in south London] but having lived in Finsbury Park myself over 30 years ago, and having thoroughly loved it, I felt a strong affection for where much of the film was set".
This was all phenomenal, partly because you feel the actors thoroughly love and suffer with their deeply etched characters.
I ran down along the river (not the most beautiful river but it is water none the less), over the bridge into Kentucky, looped my way back around and ran through fan fest thoroughly loving everything that I saw.
He needed to have them around, he felt, to relax and thoroughly enjoy himself, and he loved seeing them having fun, too: his sisters standing for pictures with the comedian Billy Crystal, going to "Regis & Kathie Lee and Lettermann.
I thoroughly enjoy talking to him, but even more, I love listening to him.
I never feel less self-conscious nor more fulfilled than when I am thoroughly and deeply loving another person — even if it hurts.
Having established fairly thoroughly that he loves his wife and kids and enjoys football, you can almost feel him struggling to find topics to write about, then struggling to find anything to say about it once he does.
