The term 'subtleties, as of meaning' can be summed up in the crossword solution 'shades' (6 letters). Subtleties refer to small or delicate distinctions or differences, often in meaning. They are usually subtle and difficult to detect, but can have a significant impact on the overall meaning of something. For example, the difference between saying 'I'm fine' and 'I'm doing okay' may seem small, but the subtleties of the two phrases can convey different levels of emotion.