The word fulsome is used quite regularly by public figures in Ireland, often politicians promising or demanding apologies. Whenever this happens, it is criticised as an “incorrect” usage: see for example this letter to the Irish Times, which supports its point by reference to the AP Stylebook.
This is not a new complaint, but it is a debatable one. The trouble isn’t that fulsome is being used incorrectly, but that it has more than one common and legitimate meaning in modern English. Compounding this is the awkward fact that some of its meanings are contradictory and used in similar contexts, so the speaker’s intent isn’t always obvious.
The disputed meaning of fulsome – “abundant, copious, full” – is the earliest sense of the word, dating to Middle English and described by Merriam-Webster’s Concise Dictionary of English Usage (MWCDEU) as “the etymologically purest sense”. It fell out of favour but returned in the 20th century, attracting criticism. Though often considered a less than proper usage, it is popular, and broadly applied: