Antonyms

Keen means sharp, intense, or highly perceptive. Dull is the antonym, meaning lacking brightness, sharpness, or interest.

Prim means stiffly formal and respectable. Rash is the antonym, as it implies acting without consideration or being overly impulsive.

Audacious means showing a willingness to take surprisingly bold risks. Timid is the direct antonym, meaning showing a lack of courage.

Aromatic means having a pleasant and distinctive smell. Odorous means having a smell, but it is often used for unpleasant smells; however, in many contexts, it is the closest antonym provided for a specific pleasant scent.

Auspicious means conducive to success or favorable. Unfavourable is the direct antonym.

Mundane refers to something lacking interest or excitement, often associated with the earthly world. Heavenly is the opposite, suggesting something divine or beyond the earthly.

Vanity refers to excessive pride in one's appearance or achievements. Modesty is the quality of being humble and unpretentious, which is the direct antonym.

Boisterous means noisy, energetic, and cheerful. Calm is the opposite, describing a state of quietness or lack of agitation.

Uncouth means lacking good manners, refinement, or grace. Refined is the direct antonym, meaning elegant, cultured, or polished.

Lethal means causing or sufficient to cause death. Safe is the direct antonym, meaning not causing harm or danger.

Diabolic means characteristic of the devil, or wicked. Kind is the direct antonym, meaning having a friendly, generous, and considerate nature.

Frugal means economical as regard to money. Extravagant is opposite to it.

Reserved: not opening up, keeping to one self, not extrovert.

Sub Rosa means privately. Hence, its opposite is "open".

Debonair means confident, stylish, and charming. Serious is the best antonym among the choices, as it contrasts with the lighthearted and carefree nature of being debonair.