Unfamiliar Words with Meanings and Sentences:
1. Ephemeral (adj.) - lasting for a very short time; fleeting.
* Sentence: The beauty of the cherry blossoms was ephemeral, lasting only a few weeks before the petals scattered.
2. Serendipitous (adj.) - occurring or discovered by chance in a happy or beneficial way.
* Sentence: We stumbled upon a serendipitous antique shop while walking through the quaint town.
3. Quixotic (adj.) - extravagantly idealistic; unrealistic and impractical.
* Sentence: His quixotic quest to find the lost city of Atlantis led him on a perilous journey across the globe.
4. Sanguine (adj.) - cheerfully optimistic; hopeful.
* Sentence: Despite the challenges ahead, she remained sanguine about the future of her company.
5. Soporific (adj.) - tending to induce drowsiness or sleep.
* Sentence: The professor's monotone voice had a soporific effect on the students, causing them to doze off during his lectures.
6. Salubrious (adj.) - conducive to health or well-being; healthy.
* Sentence: The salubrious air of the mountain resort provided a welcome respite from the city's smog.
7. Capricious (adj.) - given to sudden and unaccountable changes of mood or behavior.
* Sentence: The capricious weather patterns made it difficult to plan outdoor activities.
8. Gregarious (adj.) - fond of company; sociable.
* Sentence: The gregarious host made all the guests feel welcome and comfortable.
9. Peripatetic (adj.) - traveling from place to place, especially working or based in various places for relatively short periods.
* Sentence: As a peripatetic musician, she traveled the world, sharing her music with diverse audiences.
10. Taciturn (adj.) - inclined to silence; not talkative.
* Sentence: The taciturn old man rarely spoke, preferring to observe the world around him.
11. Obsequious (adj.) - obedient or attentive to an excessive degree; servile.
* Sentence: The obsequious waiter hovered over the table, anticipating every need.
12. Fortuitous (adj.) - happening by chance or accident.
* Sentence: The fortuitous meeting at the conference led to a groundbreaking collaboration.
13. Impertinent (adj.) - rude and disrespectful.
* Sentence: The student's impertinent remarks earned him a reprimand from the teacher.
14. Loquacious (adj.) - tending to talk a great deal; talkative.
* Sentence: The loquacious bartender regaled his customers with stories of his travels.
15. Erudite (adj.) - having or showing great knowledge or learning.
* Sentence: The erudite professor delivered a lecture on the history of philosophy.
These are just a few examples. The best way to expand your vocabulary is to read widely and engage with diverse forms of language.