ASp

I have nothing to say regarding theatre/theater because, in Blighty, it's all 're'.

Regarding relentless and unrelenting, though, I can see something that might help (or have helped) Wordwind's denotation/connotation classes. The two words should have the same denotation, but the connotations,a s other posts here have shown, can be different.

As with the others, I think of unrelenting as similar to unbending - a judge, for instance, who will show no mercy.

Relentless, on the other hand, is like a marathon runner determined to catch up with the one in front, who makes it so.

I would find it awkward to use rlentless in the case of the judge who wasn't merciful, and slightly less awkward, but still not right, to use unrelenting for the marathon runner.

Does this help?

cheer

the sunshine warrior