jibe,gibe/make fun of
jocular,meant as a joke
judicious,sound in judgment/wise 
knit,draw together/unite firmly
labyrinthine,to entangle the state of affairs
lachrymose,causing tears/tearful 
lackluster,(of eyes) dull
laconic,brief/to the point/terse 
lag,go too slow
lament,show/feel great sorrow
lassitude,weariness/tiredness 
latent,present but not yet active/developed or visible
laudatory,expressing or giving praise
lavish,giving or producing freely/liberally or generously
leakage,the process of leaking
legacy,smth handed down drom ancestors
libel,statement that damages reputation
liberality,free giving/gererosity
libertine,immoral person 
lien,legal claim until a debt on it is repaid
limn,paint/portray
limp,lacking strength/walking unevenly
lithe,bending/twisting
loll,rest/to sit or stand in a lazy way/hang (dog's tongue)
loquacious,talkative/garrulous 
lubricant,substance that makes work easier
lubricate,put oil to make work easily
lubricious,lewd/wanton/greasy/slippery 
lucubrate,write in scholarly fashion 
luculent,easily understood/lucid/clear 
lugubrious,mournful/excessively sad 
lull,become quiet or less active
luminary,star/light-giving body
lustrous,being bright/polished
macabre,gruesome/suggesting death
machination,plot/scheme (evil) 
magnanimous,generous
maladroit,tactless/clumpsy
malapropism,misuse of a word (for one that resembles it)
malevolence,wishing to do evil
malign,injurious/speak ill of smb/tell lie
malinger,to fake illness or injury/in order to shirk a duty
malleable,yielding/easily shaped/moldable/adapting 
manacle/chains for the hands or feet
martial,brave/of associated with war
massacre,cruel killing of a large number of people
matriculation,be admitted/enter a university as a student
mature,come to full development/to a state ready for use
maudlin,sentimental in a silly or tearful way
maverick,rebel/nonconformist