I think that the impediment has become more pronounced in later years, though. It's a lot more noticeable to me in some of the narrations and radio-show stuff that he's done more recently. I suspect it also has something to do with dental work he had done after the Original Series ended; that sort of sibilance is not uncommon in the speech of denture-wearers.He's always had sort of a speech impediment in which hard sounds come out a little soft for him. For example, he tends to pronounce his hard Ts as a sort of soft Th sound. Similarly, in "Live long and prosper" the "prosper" would be a little softer sounding than it might be for some people.I don't know.
When I first saw it, I thought,"Wow, he's getting old." And I thought his enunciation seemed just a bit slurred.
But after reading that he was aged for the part, I felt a lot better.![]()