Egregious

Until a few years ago, 'egregious' meant 'an X to an outlandish, or notorious, or too-obvious degree'. 'He was an egregious interloper', or 'He was an egregious fraudster'.  Normally although not exclusively it modified nouns.  Lately it's used on its own, as an adjective, meaning 'outrageous!', or 'really bad!' ('egregious' does sound like 'outrageous', so there is mitigation, of a sort). Another example of a word with a somewhat rarefied meaning that has been stripped of its subtlety, used as a shiny new way to express simple old meanings. 

A similar though decidedly less significant phenomenon afflicts the use of 'forensic'. It used to have a precise meaning:  of an investigation of a crime, death, accident or similar, that the investigation into the causes of the event involves the use of sophisticated scientific methods - fingerprints, chemical analysis, DNA and so on.  Now it often just means that the investigation with be 'really thorough!', 'painstaking!', 'no stone left unturned!'.  The excuse is simply that one wants to convey a mantle of high seriousness and no mistake, perhaps of teams of specialists arriving in unmarked cars.