1. Uninterrupted in time and indefinitely long continuing
   "the never-ending search for happiness"
   - ceaseless, constant, incessant, perpetual, unceasing, unremitting

See also: continuous, uninterrupted

• double-breasted suit
• double-check
• double-chinned
• double-click
• double-crosser
• double-crossing
• double-dealer
• double-dealing
• double-decker
• double-dip
• double-dyed
• double-edged
• double-entry bookkeeping
• double-faced
• double-geared
• double-glaze
• double-humped
• double-hung window
• double-jointed
• double-magnum
• double-park
• double-prop
• double-propeller plane
• double-quick
• double-reed instrument