windowless wall; blank wall
A wall with no windows or openings. The term 盲 (めくら, 'blind') is now considered sensitive and may be avoided in favor of expressions like 窓のない壁. Use with caution.
The back of the building was a windowless wall, with not a single window.
Compound of 盲 (めくら, 'blind') and 壁 (かべ, 'wall'), literally 'blind wall'. The exact origin is uncertain, but it likely arose as a descriptive term for a wall lacking openings.