noun - an act of buying or selling something

adjective - doing the work of another person temporarily

adverb, formal - severely or by a lot of people

adjective - existing as a natural part of something

adjective - (of an investigation, research) done extremely carefully

noun - the act of being involved in something

adjective - (of a person) not having emotional problems

adjective - impressive and costing a lot of money

noun - a particular way of thinking about something

noun - a large number of people or animals

adjective, formal - having a lot of space (very formal)

adjective - (of people) loud and noisy, causing trouble

noun - the state of being an underage person

noun - the act of trying to achieve something

noun - a lack of interest in your work