Select the most appropriate synonym of the given word.
Chaste

The correct answer is Pure.

Explanation:
The word 'Chaste' means pure in thought, style, or conduct; uncorrupted, modest, or free from vulgarity/obscenity.

Let's look at the meanings of the given options:
1. Pure: Free from anything that debases, pollutes, or contaminates; unmixed and clean. (This is the exact synonym of 'Chaste').
2. Flashy: Ostentatious, showy, or excessively bright/tacky.
3. Sullied: Damaged, defiled, or stained (an antonym of 'Chaste').
4. Corrupt: Dishonest, immoral, or tainted (an antonym of 'Chaste').

Therefore, the most appropriate synonym for Chaste is Pure.