Correct Answer: outspoken

Solution : The correct choice is the fourth option .

Explanation:
Forthright means to be direct and honest in speech or behaviour, and outspoken means similar, which is used to describe someone who freely expresses their opinions or ideas without hesitation, hence making them synonyms.

The meanings of the other options are as follows:

• A secret means something that is hidden or kept confidential.
• Tricky is used to describe something that is complicated or difficult to deal with.
• Tactful refers to the ability to handle situations delicately or in a way that avoids offending others.

Therefore, the correct answer is outspoken.