If something has plenty of space, it's roomy. Your enormous dorm room is roomy, and the sweater that hangs halfway down your thighs is also roomy.

Roomy things are spacious or sizable — they're big. A roomy old house has enormous rooms and plenty of them, and roomy clothing is the apparel that's loose and comfortable. Sometimes, roomy is used as a noun, which is also spelled roomie, as shorthand for roommate. The seventeenth century version of the adjective was roomsome.

Definitions of roomy
  1. adjective
    (of buildings and rooms) having ample space
    “a roomy but sparsely furnished apartment”
    synonyms: spacious
    commodious, convenient
    large and roomy (`convenient' is archaic in this sense)
  2. noun
    an associate who shares a room with you
    synonyms: roomie, roommate
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    type of:
    a person you know well and regard with affection and trust
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