infatuated

Foolishly or unreasoningly fond of, attracted to or in love with (someone); besotted.

1771, Elizabeth Griffith, The History of Lady Barton, London: T. Davies & T. Cadell, Volume 3, Letter 60, p. 40, […] I did not know her then, or I could never have been so infatuated as I was, to a creature so every way her inferior […]

“Gracious goodness,” the cry was, “how infatuated the mother is about that pert and headstrong boy who gives himself the airs of a lord on his blood-horse, and for whom our society is not good enough, and who would marry an odious painted actress off a booth, where very likely he wants to rant himself. …"

Excessively fond of or enthusiastic about (something).

Before I leave Switzerland I cannot but observe, that the Notion of Witchcraft reigns very much in this Country. […] The People are so universally infatuated with the Notion, that if a Cow falls sick, it is Ten to One but an Old Woman is clapt up in Prison for it […]

She was one of those people who are infatuated with patent medicines and all new-fangled methods of producing health or mending it.

Foolish, stupid, lacking good judgment (often as a result of some external influence).

[…] that people must needs be madd or strangely infatuated, that build the chief hope of thir common happiness or safetie on a single person […]

It is possible, that had they not been so infatuated, as to imagine they could retrieve in Germany all that they had lost in America, the British court in the beginning of the year 1759 might have listened to terms of accommodation.