The phrase "a difficult soul" is correct and usable in written English.
It can be used to describe a person who is complex, challenging, or hard to understand, often in an emotional or psychological context.
Example: "She has a difficult soul, always wrestling with her thoughts and feelings, making it hard for others to connect with her."
Alternatives: "a complex individual" or "a troubled spirit."
"For me... the constitutionality of the death penalty is not a difficult, soul-wrenching question," he wrote in his First Things essay.
I was scared of picking it up again, because it's such a difficult, soul-baring thing to do compared with modelling, where you just close yourself off.
With the support of a beautiful therapist, amazing friends and family, a lot of really difficult soul searching, and a shit load of reading, I was able to walk through a very difficult time in my life with what I felt was as much grace and gratitude as I could find.
After a long and difficult soul search, I finally pursued what I had gradually come to realize was my true passion.
The fight over abortion foreshadows difficult soul searching in the months ahead as Democratic lawmakers confront deepening divisions among their caucus on issues like abortion rights and gun control.
He fears being seen as a sellout, a mere merchant among the creative and difficult souls who make the art, and the hard partying seems, by his reckoning, a kind of inoculation against that.
Food became our saving grace during difficult, soul-searching days.
Wilpon told Valentine that it was a difficult decision, requiring much soul-searching, but that it made sense for the underachieving Mets to dismiss him as manager.
Players, for example, expect these games to have a certain degree of balance, with even a difficult game like Dark Souls III being difficult in a clear and comprehensible way.
Instead, he's a murderer who has panic attacks, a paunch, a troubled soul and a difficult marriage; struggling to understand precisely where, in an increasingly confused and confusing world, he fits in.
A difficult period ensued, of introspection, soul-searching, doubt, dejection, and a struggle to regain a balance that required a new strength I thought I didn't possess, and yet eventually discovered.
