I was musing the other day about the PP (prepositional phrase) complement to "enamored". My intuition is that "enamored with" is more common in modern times, but that "enamored of" is the original and prescriptively "correct" usage. Checking with the OED more or less confirms this, though the original usage, unbeknownst to me, is "enamored (up)on". "Enamored of" was the next oldest usage, and "enamored with", though listed as a possibility, didn't have any examples.
Now to check modern frequency:
enamored upon: 833 ghits
enamored on: 6380 ghits
enamored of: 644,000 ghits
enamored with: 667,000 ghits
So it appears that my intuition was marginally correct, though with the inaccuracy of google results counting, there may be no significant difference between "of" and "with". More unexpected was the auto suggestion "enamored by", which gets 128,000 hits, less than the two recent usages, but far more than the original Middle English preposition. More surprising still is "enamored for", which gets a respectable 20,100 hits (though google enjoins me to correct it to "enamored of"). Many of these look to be merely a sequence, e.g., "names that mean enamored for girls", but there are some legitimate usages: "Armored and enamored for obama in DC". As a check I ran a couple other prepositions (under, from, beside) to see if in fact all are attested, but none of these three seemed to have any legitimate hits. So people using "enamored by" and "enamored for" seem to have that as the phrase.
What does it all mean? I don't know. But based on the auto suggestions from google, people are pretty unsure of which preposition to use, though "with" and "of" are by far the most frequent.
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