Antonyms

Harshness refers to being rough, severe, or ungentle in quality or manner. Softness means the quality of being gentle, mild, or not rough. These are direct opposites in terms of physical texture or behavioral manner. Circuit, abnormal, and row are unrelated concepts.

Ugly means unpleasant or unattractive in appearance, which is the direct opposite of good-looking (attractive). Smart refers to intelligence, timid refers to shyness, and elegant is actually similar in positive connotation to good-looking. The contrast is purely about physical appearance.

Steady is the correct antonym of changeable because it means stable, constant, and not varying. The other options (uncertain, erratic, volatile) are actually synonyms or related concepts to changeable, not antonyms.

'Verity' is conformity to truth, fact or reality. Hence 'falsehood' in option (2) is the answer.

'Unimportant' would be the antonym of salient, hence, (1) is the answer.

'Dilettante' means a person who cultivates an area of interest superficially or casually, lacking deep knowledge or expertise. 'Cognoscente' (the correct antonym) refers to a person with expert knowledge or refined taste in a particular field - essentially a connoisseur. The other options (formal dress, firebrand, chaff) are unrelated words that do not convey the opposite meaning.

Furtive means done in a stealthy manner (secret). Overt means not hidden (open). So option 2 is correct.

Obfuscate means to muddle or confuse.

Ephemeral means short lived, transitory. Everlasting means never coming to an end, lasting forever (eternal). Hence, option 4 is the most opposite word to 'ephermeral'.

Aphasia is the medical term for loss of ability to speak or understand language, while volubility refers to fluent, ready speech - they are direct opposites.

Ambulatory means relating to walking or capable of walking, while bed-ridden means confined to bed and unable to walk - direct opposites.

Suave =  courteous with a degree of sophistication

Gauche = lacking social polish

Mystic = related to mysticism

Boorish = ill mannered and coarse  and contamptible in behaviour

Aromatic =  having a strong pleasant odor

So, among the 4 options the most opposite to the given word is boorish.

Blanch means to make pale or white (often through heat or by removing color), while darken means to make something dark or darker - they are direct opposites.

Saunter means to walk in a slow, leisurely, relaxed manner, while sprint means to run at full speed - one represents unhurried movement, the other maximum speed.