Select the most appropriate synonym of the given word.
Fabulous

The correct option is Remarkable.

Let us break down the meaning of the given word and compare it with the options to find the most appropriate synonym:

1. Fabulous: This word is used to describe something that is extraordinary, exceptionally good, wonderful, or extremely impressive (e.g., "a fabulous performance"). It can also refer to something legendary or mythical, but in general usage, it denotes something outstanding.

2. Remarkable: This word means worthy of attention, striking, or extraordinary (e.g., "a remarkable achievement"). Since both "fabulous" and "remarkable" are used to describe something that stands out due to being exceptional or impressive, they are close synonyms.

3. Resourceful: This refers to being good at finding clever ways to overcome difficulties. It does not share a meaning with "fabulous."

4. Regrettable: This means causing regret or being unwelcome/unfortunate, which has a negative connotation and is unrelated.

5. Restful: This describes something that is quiet, soothing, or relaxing, which does not match the exciting or extraordinary nature of "fabulous."

Therefore, Remarkable is the most suitable synonym among the choices provided.