L
laggard
Someone or something that is very slow
lassitude
Physical or mental tiredness:
Shareholders are blaming the company's problems on the lassitude of the CEO.
latent
Present but needing particular conditions to become active, obvious, or completely developed:
laudable
(of actions and behaviour) deserving praise, even if there is little or no success:
a laudable goal/ambition
legacy
Something that is a part of your history or that remains from an earlier time
The Greeks have a rich legacy of literature.
lugubrious
Sad and serious
a lugubrious face
luminary
A person who is famous and important in a particular area of activity
Luminaries of stage and screen assembled for last night's awards ceremony.