noun, technical - a serious mental condition in which a person gradually loses the ability to think, remember, and behave normally, usually because of disease or old age
verb, informal - to become upset, to become angry or unable to control one's temper
adjective, literary - causing harm, destruction, or serious damage; deadly or ruinous
noun - something that causes great distress, trouble, or annoyance; a source of harm or ruin
noun - the activity of going under water with special equipment including an air bottle
noun - the state of being important, well-known, or easily noticed
adverb - without revealing your name or identity
noun - a situation in which one event or action causes a series of other events to happen, like ripples spreading on water
noun - the quality of being dark, gloomy, or hard to see through; the quality of being unclear or difficult to understand
adjective, formal - having the same size and shape; in agreement or harmony
noun - a small, thin stick used for removing food from between the teeth
noun - a very thin thread or fibre, especially one that is long, flexible, and often delicate