Ha, I had thought that diffizil resembled filigran in meaning, but wasn't sure that weren't just me. I reasoned that diffizil would be a diffizil word, by the s

Ha, I had thought that diffizil resembled filigran in meaning, but wasn't sure that weren't just me. I reasoned that diffizil would be a diffizil word, by the sound of it, used by (to take your example) watch makers dealing with delicate problems.