The state or condition of being enamored; the quality of being deeply in love or infatuated.
From enamored + -ness (state or condition). Enamored comes from enamor, with -ed making it an adjective. The -ness suffix, from Old English, converts adjectives to nouns describing their essence.
Psychologists studying 'enamoredness' have found it's distinct from genuine love—enamored people show different brain activity than those in long-term love, with more focus on the object of desire rather than on partnership.
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