a fond [aˈfɔ̃] adv. phr.
1.) Thoroughly, fully (O.E.D. 2nd Ed.).
Etymology: French, literally "to the bottom".
"I mean we are all agreed on one point, and that is that the Comte de la Roche knows one subject a fond: Women. How was it that, knowing women as he does, he did not foresee that Madame would have kept that letter?" (The Mystery of the Blue Train, Agatha Christie, 1928).
I realized it had been a while since I had a nice French word (or phrase) on here. Hope everyone is having a good weekend. It's working on my thesis, helping my housemates dig up our garden, and a barbecue on the docket for me. Thanks for reading!