 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. "Jeffers," he announced, "this is ... just call her Betty." Jeffers seemed to stagger standing still behind his desk. Jeffers now ignored him, intent upon the girl. "You can't prove anything," declared Jeffers hoarsely. Jeffers came around his desk to assist.
 clever
 clever  persistent  hot-headed  cocky