Roomy

wiktionary

ref

room +‎  -y

etymonline

ref

roomy (adj.)

"having ample room, spacious, capacious," 1620s, from room (n.) + -y (2). Related: Roominess. Also used in this sense was roomsome (1580s); the earlier adjective simply was room (Middle English roum, Old English rum) "wide, broad, large, spacious."