I'm looking for a word to describe someone who is overly rational, in an unrealistic way. Thanks!
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I might use hyper-rational, as it emphasizes the rational aspect that the OP is requesting without a pejorative slant.
Hyper-rationality is the unquestioning faith in the efficacy of reason.
Might be an opportunity for persnickety:
giving a lot of attention to details that are minor or not important
for a particularly careful or detail-oriented person. For a more formal word, I suggest fastidious:.
very careful about how you do something
EDIT: It's been suggested that my original interpretation might be a little off-base, and conflating 'rational' with 'particular'. I agree that in this case hyperrational is the most literal and effective term.
You should use the answers provided by rome_leader. I'm suggesting something else.
I believe a vulgar word portrays a concept to the highest degree because it feels too personal. You can use anal-retentive.
too worried about being organized or tidy
There are also synonyms such as finicky, finical, fussbudgety
You could insult the person by using Brainiac or Einstein in a pejorative sense. But if the issue is that he’s being overly rational and abstract and/or theoretical to the exclusion of practical concerns, you could say that he can’t see the forest for the trees:
too involved in the details of a problem to look at the situation as a whole
or is living in an ivory tower:
an attitude of aloofness from or disdain or disregard for worldly or practical affairs