In the following question, out of the four alternatives, select the word opposite in meaning to the word given.
Perfidious
Astute means perceptive. Candour means frankness. Garish means flashy or tasteless.
Perfidious means treacherous or disloyal. So, its opposite must mean loyal or faithful.
e.g. The men remained faithful to their king.
Therefore, the correct answer is option 2.