Answer:
Pernicious (adjective)
Definition: Having a harmful effect, especially in a gradual or subtle way.
Sentence: The pernicious influence of social media on young minds is a topic of ongoing concern among researchers.
Ineffable (adjective)
Definition: Too great or extreme to be expressed or described in words.
Sentence: The beauty of the natural landscape was so ineffable that even the most skilled poets struggled to capture it in verse.
Sycophant (noun)
Definition: A person who acts obsequiously towards someone important to gain an advantage.
Sentence: The sycophant's constant flattery of the professor did not go unnoticed by the other students.
Perspicacious (adjective)
Definition: Having a keen insight or understanding; mentally sharp.
Sentence: The perspicacious detective quickly unraveled the complex murder case that had baffled others for months.
Ostensible (adjective)
Definition: Stated or appearing to be true, but not necessarily so.
Sentence: The ostensible reason for her absence from the meeting was illness, but rumors suggested a different explanation.
Proclivity (noun)
Definition: A natural inclination or tendency to do something.
Sentence: His proclivity for adventure led him to explore remote and dangerous places around the world.
Ephemeral (adjective)
Definition: Lasting for a very short time.
Sentence: The artist's ephemeral sculptures made from ice melted away within hours of their creation.
Ubiquitous (adjective)
Definition: Present, appearing, or found everywhere.
Sentence: With the rise of the internet, access to information has become ubiquitous in our daily lives.
Paragon (noun)
Definition: A person or thing regarded as a perfect example of a particular quality.
Sentence: She was considered a paragon of integrity and honesty in the business world.
Mellifluous (adjective)
Definition: Sweetly flowing or sounding.
Sentence: The mellifluous voice of the opera singer filled the concert hall with a sense of enchantment.
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