quixotic

not sensible about practical matters; unrealistic; "as quixotic as a restoration of medieval knighthood"; "a romantic disregard for money"; "a wild-eyed dream of a world state"

और न किसी काहिन की (ख्याली) बात है तुम लोग तो बहुत कम ग़ौर करते हो

His ideas are as quixotic as a restoration of medieval knighthoodHe behaves in a quixotic way.