His last few months and moments must have been spent in unimaginable pain.
The Sun
My loved ones are going through the most unimaginable pain, we are shattered beyond belief.
The Sun
Suddenly he could not do even the simplest of tasks on his own and was in unimaginable pain.
The Sun
He has borne the most unimaginable pain yet showed not an ounce of self-pity.
Times, Sunday Times
You are doing your best in the face of unimaginable pain.
Times, Sunday Times