Characters
- 冠 (冠): surname Guan
- 冕 (冕): crown in the form of a horizontal board with hanging decorations; imperial crown
- 堂 (堂): (main) hall; large room for a specific purpose; CL:間|间[jian1]; relationship between cousins etc on the paternal side of a family; of the same clan; classifier for classes, lectures etc; classifier for sets of furniture
- 皇 (皇): surname Huang
Resources
- Wiktionary: 冠冕堂皇
- MDBG: 冠冕堂皇
- Examples with 冠冕堂皇 on Tatoeba
Examples
不管你有什么冠冕堂皇的理由，这样做是不对的。