Synonyms

Ribald describes something that is vulgar, indecent, or lewd in nature. Scurrilous shares this meaning of being coarse, vulgar, or indecent in expression. The other options (impose, animosity, audacious) do not convey this sense of vulgar or indecent language.

In Greek mythology, the halcyon was a legendary bird believed to calm the seas and winds. The term comes from the myth of Alcyone and Ceyx, where the bird was said to nest on floating seas during a peaceful period. The other options are incorrect - halcyon is not an insect, tropical animal, or Greek God directly.

Inquisitive means having a strong desire to learn or know something, showing curiosity. Curious is the direct synonym, sharing the same meaning of being eager to learn or investigate. Barnyard, grisly, and attentive do not capture this quality of inquisitiveness.

Means tired/weary.

Morbid means unhealthy, diseased, or having an abnormal interest in unpleasant subjects. Gloomy captures one aspect of morbid - the depressing or dark quality associated with disease or unhealthy mental states. Fantastic and perception are unrelated; posperous is a typo.

Both mean to make return  or repayment.

Nascent means 'just coming into existence' or 'beginning to develop'. It comes from the Latin word 'nascere' (to be born). 'Wild', 'Pony', and 'Weave' are unrelated to the meaning. 'Beginning' is the closest synonym.

Nadir means the lowest point or point of greatest depression/adversity. It's the opposite of zenith (highest point). 'Elevation', 'Present', and 'Near' do not convey the meaning of lowest point.

Natty means neat, trim, and smart in appearance. Spruce as an adjective shares this exact meaning of being well-groomed and stylish. The other options (vile, cruel, mince) are unrelated to the concept of neatness or smart appearance.

Nimble means quick, light, and agile in movement or thought. Sprightly captures this quality of liveliness and quickness perfectly. Core, fore, and smear are semantically unrelated to the concept of agility or quickness.

Nefarious means wicked, evil, or villainous in nature. Wicked is the closest synonym among the options, directly matching the evil quality that nefarious describes. Linger, loom, and edify have positive or neutral meanings unrelated to wickedness.

Nihilistic relates to nihilism - the belief that nothing exists or that life is meaningless. Option C directly defines this philosophical position. Nepotism (favoring relatives), narcissism (self-obsession), and believing in oneself are unrelated to nihilistic philosophy.

Noxious means harmful, poisonous, or dangerous. Harmful is the precise synonym among the options. Hone (sharpen), pane, and porous are unrelated to the concept of danger or harm.

Novice means a person new to or inexperienced in a field or situation. Beginner is an exact synonym, directly matching this meaning. Jettison (throw overboard), deadly, and more are unrelated to the concept of being new or inexperienced.