Correct Answer: appealing

Solution : The correct choice is the third option.

Fascinating is an adjective that describes something extremely interesting, captivating, or enchanting. When searching for a synonym, it's important to choose a word that maintains the positive connotation associated with being fascinating. Appealing fits this criterion, as it denotes something attractive or interesting, aligning well with the sense of fascination.

The meanings of the other options are as follows:

• Tiring : This term signifies exhaustion or weariness.
• Boring : This term indicates something dull or uninteresting.
• Stupid : This word denotes a lack of intelligence or a poor level of reasoning.