Antonyms

Surfeit means an excessive amount or overindulgence in something. A shortage represents the opposite - a lack or deficiency. Options like confidence, quick temper, and inconsistency are unrelated to the concept of excess.

Detestable means deserving hatred or disgust. Agreeable means pleasant or enjoyable - directly opposite. Measurable (able to measure), mature (fully developed), and expensive (costly) are unrelated to hatred/disgust.

A drawback is a disadvantage or hindrance. A boon is a benefit or advantage - the direct opposite. Festivity (celebration), proposal (suggestion), and tabulation (arrangement in tables) are not opposites of drawback.

Artifice means deceit or pretence. The most nearly opposite will be "sincerity". Sincerity means absence of pretence or deceit.

Prodigal means a person spending money recklessely. The most nearly opposite will be "economical person".

'Sever' means to cut off, divide, or separate (like severing a connection or limb). Its opposite is 'unite', to join together or combine. 'Weaken' (A) is unrelated to separation; 'disavow' (C) means to deny responsibility; 'pacify' (D) means to calm.

'Svelte' means slender, slim, or elegant in appearance. Its opposite is 'obese', excessively overweight. 'Resistant' (A) refers to opposition, not body type; 'humid' (D) describes moisture; 'curved' (C) is about shape, not weight.

'Sanction' means to approve, authorize, or give official permission (as in sanctioned events). Its opposite is 'disapprove', to reject or forbid. 'Legalize' (A) is actually a synonym, not an antonym; 'end' (C) and 'disturb' (D) are unrelated.

'Sanguine' means optimistic, hopeful, or confident, derived from the belief that blood (sanguis) was associated with a cheerful temperament. Its opposite is 'pessimist' (though more precisely 'pessimistic'). 'Mechanical' (A), 'vital' (B), and 'stealthy' (C) are unrelated.

'Saturnine' means gloomy, melancholy, or sullen, derived from the influence of the planet Saturn, believed to cause a heavy temperament. Its opposite is 'blithe', cheerful, carefree, or joyous. 'Brawny' (A) means muscular; 'mercurial' (B) means changeable/volatile; 'ashen' (C) means pale.

'Sacrosanct' means holy, sacred, or inviolable, something that must not be violated. Its opposite is 'unholy', profane or not sacred. 'Religious' (A), 'sanctimonious' (B) (hypocritically pious), and 'sacramental' (C) (related to sacraments) all relate to holiness, making them synonyms or related terms, not antonyms.

'Slack' means negligent, lax, or lacking in diligence (as in 'slack off'). Its opposite is 'active', energetic, diligent, or industrious. 'Rough' (A) refers to texture; 'liberal' (C) is political/generous; 'failiar' (D) is a typo. 'Slack' can also mean 'loose' (as in a slack rope), but in work contexts it means negligent.

'Seedy' means shabby, run-down, or disreputable in appearance or character. 'Elegant' means graceful, stylish, and refined - the opposite of seedy. Intricate means complex, tranquil means calm, and irregular means not uniform, none of which directly contrast with seedy.