Meaning: Severe is someone or something that is very serious, harsh or critical.
Example: A severe blow from the boxer knocked him down.
Synonyms: Uncompromising, Harsh, Relentless, Serious
Antonyms: Gentle, Clement, Forbearing, Lenient, Kind

Meaning: Impecunious is a person without any money.
Example: If you are hard up, broke, penniless, or strapped for cash, you could describe yourself as impecunious.
Synonyms: Beggared, Broke, Destitute, Impoverished
Antonyms: Moneyed, Rich, Wealthy

Meaning: Boisterous is something noisy, loud and rowdy.
Example: The group remained boisterous despite its size.
Synonyms: Noisy, Clamorous, Loud, Riotous
Antonyms: Calm, Low, Soft, Moderate

Meaning: The meaning of treacherous is someone who is guilty of dishonesty or betrayal, or something that is dangerous or hazardous.
Example: How would you like to take a treacherous ride?
Synonyms: Dishonest, Disloyal, Slippery, Tricky, Unreliable
Antonyms: Honest, Reliable, Loyal, Forthright, Harmless

Meaning: The meaning of conceit is a strong, exaggerated opinion of one's self.
Example: The conceited boxer put a statue of himself in his front yard.
Synonyms: Egotism, Arrogance, Complacence, Narcissism
Antonyms: Humility, Modesty, Meekness, Shyness, Timidity