Synonyms

Fractious describes someone who is irritable and quarrelsome. Irritable is the correct synonym.

Grubby means dirty or unwashed. Unwashed is a direct synonym.

Covetous means having a strong desire to possess something that belongs to someone else. Grasping is the correct synonym as it implies greed.

Specious means superficially plausible but actually wrong. Insincere is the best fit among the options provided.

Insipid means lacking flavor, vigor, or interest. Flat is a common synonym used to describe things that lack taste or excitement.

Licentious refers to lacking legal or moral restraints, especially in sexual conduct. Immoral is the correct synonym.

Mystique is a fascinating aura of mystery, awe, and power surrounding someone or something. Charm is the closest synonym in this context.

Contrite means feeling or expressing remorse or penitence. Repentant is a direct synonym.

Credence means belief in or acceptance of something as true. Trust is the correct synonym.

Hideous means extremely ugly or unpleasant. Revolting is a strong synonym for this.

Acrid means having an irritatingly strong and unpleasant taste or smell. Bitter is the correct synonym.

Acuity refers to sharpness or keenness of thought, vision, or perception. Option D (Sharpness) correctly captures this quality, though it's misspelled as 'Sharpess' in the question. The other options (Side, Old, Shy) are unrelated to keenness or acuity.

'Frugality' means quality of being economical. Thriftiness means economic management. Hence, option 3 is a synonym.

'Vigour' means effort, energy, and enthusiasm. Hence, option 2 is a synonym.

'Lauded' means 'praised'. Hence, it is a synonym.