Synonyms

Natal relates to the time or place of one's birth. Therefore, 'of birth' is the correct synonym.

Necromancy is the supposed practice of communicating with the dead, often associated with magic or witchcraft.

A nemesis is a long-standing rival or an archenemy. Adversary is a direct synonym for an opponent or enemy.

A neophyte is a person who is new to a subject, skill, or belief. A novice is a beginner or someone inexperienced.

Nether means situated down or below. It is often used in terms like 'nether regions'.

 Something that is noisome or noisy is generally foul and disgusting (i.e. the stream is noisome due to the effluence coming from the factories, which are fouling it.

A nonentity is a person or thing with no special or interesting qualities; an unimportant person.

To nettle someone is to irritate or annoy them.

Niggardly means stingy or ungenerous. Meager refers to something that is lacking in quantity or quality, which is the closest synonym among the choices.

Obloquy means strong public criticism or verbal abuse, which leads to disgrace or dishonor.

Obsequious means obedient or attentive to an excessive or servile degree. Flattering is the most accurate synonym for this behavior.

Obdurate means stubbornly refusing to change one's opinion or course of action. Adamant means refusing to be persuaded or to change one's mind.

Obeisance is a gesture expressing deferential respect, such as a bow or curtsy.

Obstinate means stubbornly refusing to change one's opinion or chosen course of action, despite attempts to persuade one to do so.

Obstreperous means noisy and difficult to control. While 'hostile' is a strong negative, it is often used in this context to describe someone who is aggressive or defiant.