intransigent uncompromising
    introspection examining one's own thoughts and feelings
    invective abusive language， curses
    inveigle trick by using flattery， deception
    inveterate deep-rooted. long-established
    irate angry
    ire anger
    irksome tiresome
    irrelevant not relevant， not connected
    irrevocable final and unalterable
    itinerary plan for a journey， details or records of a route
    jabber talk excitedly； utter rapidly
    lackluster （of eyes） dull
    lag go too slow
    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
    lien legal claim until a debt on it is repaid
    limp lacking strength， walking unevenly
    loll rest， to sit or stand in a lazy way； hang （dog's tongue）
    loquacious talkative
    lubricant substance that makes work easier
    lubricate put oil to make work easily
    lugubrious dismal， mourful；
    lull become quiet or less active
    luminary star， light-giving body
    macabre gruesome， suggesting death
    maladroit tactless， clumpsy
    malapropism misuse of a word （for one that resembles it）
    malign injurious， speak ill of smb， tell lie
    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
    mendacious false
    mercurial lively， quick-witted； inconsistent， changeable
    meretricious attractive on the surface but of little value
    mischievous harmful， causing mischief
    miser person who loves wealth and spends little
    missile smth that is thrown or shot
    moderation quality of being limited， not extreme
    mollify make calmer or quiter
    molt moult， lose hair， feathers before new growing
    morbid diseased， unhealthy （eg. about ideas）
    morose ill-tempered， unsocial
    mortuary place where dead bodies are taken to be kept until burial
    mundane wordly， ordinary， dull
    negligent taking too little care
    noisome offensive， disgusting （smell）