 Which word doesn't describe Jeffers?
"Try not to be simple—for once!" growled Jeffers. It had been built for Ganymede, but not for Jeffers. "Okay I can't fire you legally—as long as you report for work," grumbled Jeffers, by now a shade more ruddy. His contract guaranteed a pilot's rating, but someone had neglected to specify the type of craft to be piloted. He soon found that there was nothing for him to do but hang around the garage in case a spaceship should land. Sometimes there's no reason but them for sending a ship back with a crew instead of in an economy orbit. They found they could send back loaded ships by 'automatic' flight—that is, a long, slow, economical orbit and automatic signalling equipment.
 clever
 clever  persistent  hot-headed  cocky