Correct Answer: hostile

Solution : The correct choice is the third option .

Inimical is used to describe something that is harmful, unfriendly, or adverse.

Hostile means unfriendly, antagonistic, or opposed. Both of these words convey a sense of opposition, and thus, are synonyms.

The meanings of the other options are as follows:

• Boisterous means to be cheerful and energetic.
• Frightening means terrifying.
• Energetic means full of energy.