Compounds of 逞

• 不逞
  (adj-na,n) insubordination
  outlawry
• 逞しい
  (adj-i) (uk) burly
  strong
  sturdy
  (P)
• 不逞の輩
  (n) lawless people
  gang
  malcontents
  recalcitrants
• 逞しくする
  (vs-s,vt) to give rein to
• 逞しゅうする
  (vs-s,vt) to give rein to