This set of words may be used in day to day conversations.

Advanced vocabulary

Lasting for a very short time; transient.

A person who acts obsequiously towards someone important in order to gain advantage.

Intended for or likely to be understood by only a small number of people with specialized knowledge.

Having a harmful effect, especially in a subtle or gradual way.

Fluent or persuasive in speaking or writing.

Behaving or looking as though one thinks they are superior to others.

Exceedingly idealistic; unrealistic and impractical.