If I had to pick a single, evocative synonym for unattainable, idealized love in fiction, I'd go with 'chimeric love'.
I use 'chimeric' because it carries that delicious mix of beauty and impossibility — a stitched-together dream that looks perfect from afar but can't exist in the real world. In novels and films you see characters fall in love with an idea rather than a person: Gatsby chasing Daisy in '
The Great Gatsby' is practically a textbook example. The lover isn't pursuing human flaws and daily compromises; they're pursuing a manufactured perfection, which is why the emotion feels so tragic and resonant.
Calling it 'chimeric love' also gives you room to describe different flavors: hybridized longing, projection, and myth-making. It's useful when you want to emphasize how the object of affection is partly fantasy, partly memory, and partly projection. Writers who dramatize this often mix nostalgia, myth, and selective memory, and labeling the feeling 'chimeric' helps readers understand that
the passion is structurally impossible. Personally, I adore the way the phrase frames longing as both beautiful and a little poisonous — it's the kind of heartbreaking thing I come back to in stories when I want to feel moved and a little wiser afterward.