| Term | Definition |
| jejune | without interest or significance,dull,insipid,juvenile,immature, childish,lacking knowledge or experience,uninformed |
| jeremiad | a prolonged lamentation or mournful complaint,A literary work or speech expressing a bitter lament or a righteous prophecy of doom |
| jingo | a person who professes his or her patriotism loudly and excessively, favoring vigilant preparedness for war and an aggressive foreign policy. |
| juxtaposition | an act or instance of placing close together or side by side, esp. for comparison or contrast |
| kowtow | to act in an obsequious manner,show servile deference,to touch the forehead to the ground while kneeling,as an act of worship,reverence,apology, etc., esp. in former Chinese custom |
| koan | a nonsensical or paradoxical question to a student for which an answer is demanded,the stress of meditation on the question often being illuminating |
| lachrymose | suggestive of or tending to cause tears,mournful,given to shedding tears readilytearful |
| laconic | using few words,expressing much in few words,concise |
| laissez faire | the theory or system of government that upholds the autonomous character of the economic order,believing that government should intervene as little as possible in the direction of economic affairs,the practice or doctrine of noninterference in the affairs of others, esp. with reference to individual conduct or freedom of action. |
| lexicon | a wordbook or dictionary, esp. of Greek, Latin, or Hebrew.the vocabulary of a particular language, field, social class, person, |
| loquacious | talking or tending to talk much or freely, talkative,chattering, babbling, garrulous,characterized by excessive talk,wordy |
| lucubrate | to work, write, or study laboriously, esp. at night. to write learnedly. |
| lugubrious | mournful, dismal, or gloomy, esp. in an affected, exaggerated, or unrelieved manner |