STAID
Option B
Staid (سنجیدہ) means serious, respectable, and unadventurous.
Depressive (اداس) means causing sadness.
Sedate (پرامن) means calm, dignified, and unhurried.
Backward (پیچھے) means behind in development.
Dull (بے رنگ) means lacking interest or excitement.