Explanation:

- Scintillating: This word describes something that is brilliantly lively, stimulating, or witty.

- Option 1: Glittering - This synonym suggests sparkling or shining with reflected light, which is similar to scintillating in its symbolic sense of being interesting or brilliant.

- Option 2: Stinging - Refers to causing sharp mental or physical pain, not fitting the context of brilliance or liveliness.

- Option 3: Flattering - Means praising excessively, which isn't closely related to the meaning of scintillating.

- Option 4: Boring - Opposite of scintillating; means dull or uninteresting.