The Collaborative International Dictionary of English v.0.48:
Leniently \Le"ni*ent*ly\, adv. In a lenient manner. [1913 Webster]WordNet (r) 3.0 (2006):
leniently adv 1: in a permissively lenient manner; "he felt incensed that Tarrant should have been treated so leniently given his crime" [syn: laxly, leniently]