Select the most appropriate synonym of the given word.

Erudite

The correct answer is Scholarly.

Explanation:
The word 'Erudite' refers to having or showing great knowledge or learning; possessing deep knowledge gained through scholarly study.

Let's look at the meanings of the given options:
1. Gullible: Easily deceived or tricked; credulous.
2. Indolent: Wanting to avoid activity or exertion; lazy.
3. Scholarly: Involving or relating to serious academic study; learned or erudite.
4. Belligerent: Hostile, aggressive, or warlike.

Therefore, the most appropriate synonym of Erudite is Scholarly.