1. Lacking a pilot
   "a drone is a pilotless aircraft"

See also: remote-controlled, unmanned

• steamroll
• steamroller
• sea scooter
• sea scorpion
• Sea Scout
• sea serpent
• sea shanty
• sea slater
• sea slug
• sea snake
• sea spider
• sea spray
• sea spurry
• sea squab
• sea squill
• sea squirt
• sea star
• sea starwort
• sea steps
• sea swallow
• sea tang
• sea tangle
• sea trifoly
• sea trout
• sea turtle