All down-to-earth antonyms

adj down-to-earth

• unrealistic — interested in, concerned with, or based on what is real or practical: a realistic estimate of costs; a realistic planner.
• irrational — without the faculty of reason; deprived of reason.
• impractical — not practical or useful.
• unreasonable — not reasonable or rational; acting at variance with or contrary to reason; not guided by reason or sound judgment; irrational: an unreasonable person.
• unsensible — having, using, or showing good sense or sound judgment: a sensible young woman.