AnnaS, I am wondering...If we consider the usage of these adjectives as regards people, personalities or behaviour, do you think, we subconsciously use them with positive/negative connotations? Relentless for e.g., is used positively, as in, 'relentless determination' or 'relentless effort', 'relentless courage' whereas, an unrelenting stance for e.g., connotes a more negative rigid/unbending attitude.