In the following question, out of the given four alternatives, select the one which is opposite in meaning to the given word.
Brindled

Brindled describes an animal skin or coat that is brownish or tawny with streaks or spots of a darker color (i.e., patterned or flecked).
Unflecked means plain, spotless, or unspotted, making it the exact opposite in meaning.

Tabby, Spotted, and Stippled all describe patterns containing spots, patches, or streaks, making them closer to synonyms.