Source : Webster's Revised Unabridged Dictionary (1913)

Laxly \Lax"ly\, adv.
   In a lax manner.

Source : WordNet®

laxly
     adv : in a permissively lenient manner; "he felt incensed that
           Tarrant should have been treated so leniently given his
           crime" [syn: {leniently}]