Choose the most appropriate antonym for the word: Volatile

The correct answer is Option (1) → Calm 

• Volatile (Adjective) means:

  1. (Of a person or situation) Liable to change rapidly and unpredictably, especially for the worse; unstable or explosive.

  2. (Of a substance) Easily evaporated at normal temperatures.

• Calm (Adjective) means: Not subject to change; peaceful; tranquil. This is the clear opposite of being rapidly and unpredictably changeable

Other Options: 

• Erratic is a synonym, meaning not even or regular in pattern or movement; unpredictable.

• Capricious is a synonym, meaning subject to sudden and unaccountable changes of mood or behavior.

• Translucent means allowing light, but not detailed images, to pass through. (Unrelated).