quixotic
Pronunciation: /kwikˈsätik/
exceedingly idealistic; unrealistic and impractical
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Bob was equal parts pedantic and quixotic. It made him hard to live with. Betty was never sure how to take his pronouncements, Was he on track or off the rails?
[I'm thinking that I once had a children's book in which a train kept going off the tracks, shirking responsibilities. I cannot seem to find it with Internet search. Only The Little Engine that Could comes up, but the plot of that book doesn't seem to fit. Can anybody help? Am I crossing up with "Ferdinand the Bull" in my memories?]