adjective - hard, not able to be bent

noun - someone's health and happiness

adjective - happening again and again in an irritating way

adjective - continuing for a long time in the same way

noun - the murder of someone important, especially for political reasons

noun, technical - an animal that has a backbone

noun - a type of fish that have long hairs around their mouths

noun - a person whose job is to find out secret information for a government or other organization

verb - to make a dangerous or tense situation calmer

noun - a hard, black substance obtained by burning wood without much air, can be used as fuel

adjective, American English - fairly large

adjective, British English - fairly large

adjective - (of food) difficult to digest

adjective - existing as a natural part of something

phrase - sleeping very deeply