A. childish
B. ugly
C. insane
D. proper

Explanation:

The word decorous means polite, well-behaved, and following accepted standards of good behavior.

In simple words: acting in a respectful and appropriate manner.

So, the synonym of decorous is proper.

Real-Life Example

• Sitting quietly in a formal meeting → decorous behavior
• Speaking respectfully to elders → proper behavior

Good manners = Decorous / Proper

Main Points for Exams

• Decorous means polite and well-mannered.
• Proper is its correct synonym.
• Other options are unrelated or opposite.
• Therefore, Proper is the correct answer.
• Common in PPSC, FPSC, CSS, PMS, NTS, IELTS, TOEFL exams.

Quick Memory Trick

🎩 Decorous = Good Manners
✔️ Proper = Same Meaning

Rude ↔ Decent
Decorous ↔ Proper ✔️