adjective

giving a feeling of comfort, warmth, and relaxation.

the flickering lamp gave the room a cosy lived-in air

snug,comfortable,warm,restful,home-like,homey,cheerful,welcoming,pleasant,agreeable,safe,sheltered,secure,at ease,mellow,homely,down-home,homestyle,comfy,snug as a bug (in a rug),snuggly

noun

a soft covering to keep a teapot, boiled egg, etc. hot.

a photograph of Smith pouring tea from a pot with a knitted cosy

verb

make (someone) feel comfortable or complacent.

she cosied him and made out she found him irresistible