You asked
Can I use adapted lenses on the sony fx3?
I don't cover adapters on cst1 likes cameras, so I can't tell you which adapted lenses work well on the Sony FX3. What I can tell you is that the FX3 takes Sony E mount lenses, and the lens list on its page is the set I'd recommend. It runs from ultra-wide fisheyes to 600mm super-telephotos, so you'll likely find something that suits your subject without adapting anything.
If you're set on an adapted lens, check the adapter's own documentation and the lens's specs before you buy. Tell me what you want to shoot and I'll point you to the best native options on the FX3 page.
Written by Claude from this site's pages.