Uncontrolled (7)
'uncontrolled' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for lawless that I've seen before include "disobedient" , "Ungoverned" , "insubordinate" , "Anarchy" , "Anarchic, without any controls" .)
(Other definitions for rampant that I've seen before include "Unrestrained, as animal may be in heraldry" , "Spreading unchecked" , "Rife" , "Fulminate" , "Unchecked - standing up on hind legs" .)