1. ALLAY (VERB):Reduce something, usually a pain or a problem

Synonyms: comfort, soothe         

Antonyms:  irritate, agitate

Example Sentence:

Henery hoped a doctor’s diagnosis would allay her worry about the rash on her arm.

2. LASSITUDE (NOUN):Lethargy

Synonyms: apathy, exhaustion 

Antonyms: action, diligence

Example Sentence:

Persons who do not sleep well are often worn out during the day because of lassitude.

3. UPBRAID (VERB): Scold

Synonyms: chide, castigate 

Antonyms:  laud, praise

Example Sentence:

The police officer did not hesitate to upbraid the man for driving without license.

4. FORTITUDE (NOUN): Strength of mind

Synonyms: courage, boldness 

Antonyms: apathy, cowardice

Example Sentence:

 

Most successful people are not afraid to show fortitude when they face failure.

5. QUIXOTIC (ADJECTIVE):Impractical

Synonyms: illogical, dreamy   

Antonyms:  cautious, pragmatic 

Example Sentence:

Your idea is bit quixotic.

6. NOXIOUS (ADJECTIVE):Pernicious 

Synonyms: fetid, putrid 

Antonyms:  helpful, healthy 

Example Sentence:

This drug proved noxious when tested in laboratory.

7. INGENIOUS (ADJECTIVE):Skilful

Synonyms: clever, creative 

Antonyms:  dull, foolish

Example Sentence:

Ravi was ingenious enough to overcome the limited budget.

8 IRATE (ADJECTIVE): Angry

Synonyms: annoyed, enraged 

Antonyms:  happy, pleased

Example Sentence:

My best friend was irate about me wrecking her car.

9. PREMISE (NOUN):Hypothesis

Synonyms: assumption, presumption 

Antonyms:  fact, reality

Example Sentence:

Since his premise cannot be confirmed, his entire theory is worthless.

10. PEREMPTORY(ADJECTIVE): Overbearing

Synonyms: absolute, commanding             

 Antonyms: easy-going, indulgent

Example Sentence:

The commander in chief gave the troops a peremptory order which they had to obey.