How to concisely and accurately describe the effect many words (usually adjectives/adverbs) are suffering from, where:
they have a clear primary meaning but end up being used merely for emphasis, or to describe something similar but much less significant
were you to use them with the primary meaning in mind, you'd need to clarify which it is to be understood, often for the message to even be noticed
they are the most accurate words for what you have in mind, the lack of unambiguous drop-in replacements setting them apart from the many other words whose meaning drift does not have the same frustrating impact
Examples:
"Stop, you're literally killing me" (You are causing me lethal damage; not making me rotfl)
"Uncanny semblance" (saliently disturbing similarity, as in uncanny valley; not just remarkable, amazing, significant, interesting, curious likeness)
[edit] The focus is on the effect that has made the words difficult to use in their primary meaning.
