1. CONSPICUOUS (ADJECTIVE):obvious

Synonyms: clear, apparent Antonyms: hidden, concealed

Example Sentence:

Her conspicuous lack of warmth confirmed that they were no longer friends.

2. CONSPIRE (VERB):to plot, scheme with someone

Synonyms: collude, connive Antonyms: disagree, neglect

Example Sentence:

I had a persecution complex and thought, people were conspiring against me.

3. CONSTERNATION (NOUN):a feeling of anxiety or dismay

Synonyms: distress, disquiet Antonyms: happiness, calmness

Example Sentence:

His decision caused consternation among his colleagues.

4. CONSTRAIN (VERB):restrict

Synonyms: curb, restrain Antonyms: allow, assist

Example Sentence: 

Women are too often constrained by family commitments.

5. CONSTRUE (VERB):To understand or explain the meaning of 

Synonyms: define, infer Antonyms: confuse, fail

Example Sentence:

The waiter construed my smile as assent.

6. CONSUMMATE (ADJECTIVE):perfect

Synonyms: supreme, polished Antonyms: incomplete, imperfect

Example Sentence: 

She acted the part with consummate skill.

7. CONTAMINATE (VERB):to make impure 

Synonyms: pollute, infect Antonyms: cleanse, purify

Example Sentence: 

The town’s water-supply has been contaminated by chemicals from the factory. 

8. CONTEMPLATIVE (ADJECTIVE):thoughtful

Synonyms: reflective, introspective Antonyms: ignorant, disdainful

Example Sentence: 

He is a quiet, contemplative sort of a chap.

9. CONTEMPT (NOUN):very low opinion; scorn

Synonyms: derision, disrespect Antonyms: regard, respect

Example Sentence: 

She spoke with utter contempt of her husband’s behaviour.

10. CONTEND (VERB): argued

Synonyms: asserted, confronted Antonyms: agree, comply

Example Sentence:

She contended that taxes were too high.