The only thing that accounts for this context clues worksheet on the verb enamor in my folders is that it must have been the Word of the Day at Merriam-Webster at some point. My crowd does tend to use the word a good deal, but I can’t say with any certainty that it is a commonly used English word. You won’t be surprised to hear, owing to the presence of the Latinate root amor, that this verb means “to inflame with love — usually used in the passive with of “; less, well, passionately, enamor can also mean “to cause to feel a strong or excessive interest or fascination — usually used in the passive with of or with <baseball fans enamored of statistics>.”
In any case, it is used only transitively. Don’t forget your direct object, and nota bene, as above, that on generally uses of or with to precede the direct object of enamor.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.