John's Dictionary of Words You Should Know

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A ~ means it is one of the 110 hardest words on the SAT.

-J-

jurisprudence-the science of law

-K-

-L-

laconic-keeping brief and to the point, saying little
laggard-one known for being habitually tardy, dilatory
languid-exhausted and lacking energy
~legion-a very large number
lethargic-exhausted and lacking energy
~levity-light-hearted humor
~limpid-transparent, perfectly clear
~linchpin-the key element in something
listless-exhausted and lacking energy
loafer-one known for being lazy
loiterer-one known for idleness
loquacious-overly talkative
lucid-clear, readily understood