One Word Substitution

Punctilious means showing great attention to detail or etiquette, sometimes excessively formal. Sceptics question claims. Theists believe in gods. Atheists lack religious belief. Punctilious precisely describes someone meticulous about social rules and formalities.

Introverts direct attention inward rather than outward. 'Complicate' is a verb, not a person. 'Place' makes no contextual sense. 'Old' is nonsensical filler. Introversion is the established psychological term for inward-focused personality types.

Etymology is the study of word origins and derivations (from Greek 'etymon' - true sense). Biology studies life. Atheists reject deity belief. 'None of these' is incorrect since Etymology is the correct answer. Etymology traces linguistic evolution and word relationships.

Verbatim means word-for-word exact reproduction (Latin 'verbum' - word). Taciturn means reserved. Suicide is irrelevant. Theists believe in gods. Verbatim is the standard term for precise quotation without alteration.

Expurgate means to remove objectionable material from texts (Latin 'expurgare' - to purge out). The other options are nonsensical distractors. Expurgation is censorship practice, especially used historically to 'clean' literature for moral acceptability.

A pedestrian is defined as a person who travels on foot, typically by walking. The term directly corresponds to the definition provided in the question. The other options - bigot (intolerant person), old (aged), and atheist (someone who denies God's existence) - do not relate to walking on foot.

A Pyrrhic victory is a victory at a devastating cost.

Invulnerable is the correct term for something that cannot be hurt, harmed, or damaged. The prefix 'in-' means 'not' and 'vulnerable' means 'capable of being hurt'. Empiric refers to empirical observation, zoo is a place for animals, and 'none of these' is incorrect since option C is correct.

Inanimate correctly describes an object that has no life or is not alive. The term comes from Latin 'in' (not) + 'animus' (life/soul). Visible relates to sight, earthy means made of earth, and mortal means subject to death (which implies having life first).

Insoluble is the precise term for something that cannot be dissolved, especially in a liquid. The prefix 'in-' means 'not' and 'soluble' means 'capable of being dissolved'. Mortal means subject to death, immoral means unethical, and 'none of these' is incorrect.

Misanthropist is the correct term for someone who hates mankind. The word comes from Greek 'misos' (hatred) + 'anthropos' (human beings). An atheist denies God's existence, a theist believes in God, and 'old' is an adjective unrelated to hatred of humanity.

Gregarious correctly describes animals that enjoy living in groups or flocks. It refers to the tendency of animals to form social groups. Synonyms are words with similar meanings, a fool is a foolish person, and feet are body parts - none relate to flock behavior.

Undertaker is the professional who manages funeral arrangements and handles the burial or cremation of the dead. A pedant is someone who obsesses over minor details, pugnacity refers to aggressiveness, and a theist believes in God - none relate to funeral management.

Infallible describes someone or something incapable of making mistakes or errors. The word combines 'in-' (not) + 'fallible' (liable to err). Synonyms are alternative words, silent means quiet, and 'none of these' is incorrect since option B is correct.

Bibliophile is the correct term for a lover of books. The word combines Greek 'biblio' (books) + 'phile' (lover). A philosopher loves wisdom, a nihilist believes in nothing, and an atheist denies God's existence - none specifically relate to books.