1. FECKLESS (ADJECTIVE): (उद्देश्यहीन): without purpose
Synonyms: aimless, carefree
Antonyms: purposeful, efficient
Example Sentence:
It was a feckless attempt to make the company a success. 
2. MERCURIAL (ADJECTIVE): (अस्थिर): flighty, temperamental
Synonyms: changeable, impulsive
Antonyms: constant, stable
Example Sentence: His mercurial temperament made him difficult to work with his teammates. 
3. SPECIOUS (ADJECTIVE): (भटकाने वाला): misleading
Synonyms: deceptive, false
Antonyms: genuine, valid
Example Sentence:
His readings are seeming to be specious. 
4. QUIXOTIC (ADJECTIVE): (विलक्षण): idealistic
Synonyms: impractical, dreamy
Antonyms: realistic, sensible
Example Sentence:
It was clearly a quixotic case against the defendant. 
5. DISINGENUOUS (ADJECTIVE): (कपटी): not straightforward or candid
Synonyms: unfair, cunning
Antonyms: frank, truthful
Example Sentence:
It was disingenuous of her to claim she had no financial interest in the company. 
6. DERISIVE (ADJECTIVE): (व्यंग्यात्मक): ridiculing
Synonyms: cheeky, mocking
Antonyms: polite, respectful
Example Sentence:
It was a derisive act. 
7. ODIOUS (ADJECTIVE): (घिनौना): extremely unpleasant
Synonyms: disgusting, horrid
Antonyms: attractive, delightful
Example Sentence:
The detective said it was the most odious crime she had ever seen. 
8. FORTUITOUS (ADJECTIVE): (आकस्मिक): lucky, accidental
Synonyms: random, chance
Antonyms: intentional, planned
Example Sentence:
The check could not have arrived at a more fortuitous time. 
9. RAPACIOUS (ADJECTIVE): (अति लोलुप): aggressively greedy or ravenous
Synonyms: ferocious, marauding
Antonyms: satisfied, contended
Example Sentence:
He is a rapacious lawyer. 
10. HALCYON (ADJECTIVE): (धीर): calm, peaceful
Synonyms: quiet, still
Antonyms: agitated
Example Sentence:
It is such a halcyon place