Cosiest

Cosiest is the superlative form of cozy, used to describe the greatest degree of warmth, comfort, or homely charm. It is commonly applied to rooms, clothing, and experiences that evoke safety or contentment. Examples include a cosiest corner by the fire, a cosiest pub in town, or a cosiest night in with a book.

Spelling and regional variation: cos y is British English; cozy is American English. The superlative is cosiest in British English and coziest in American English. The adverb form can be cosily or cozily depending on spelling. The word stems from cozy and is part of informal, intimate usage rather than a formal synonym.

Usage notes: Cosiest emphasizes a homely warmth rather than luxury. It can describe tangible spaces or intangible atmospheres, and is often used in travel writing, interior design, and everyday speech to signal comfort and ease rather than opulence. Related terms include snug, homely, warm, and inviting; antonyms include chilly or uncomfortable.