inveterate

  1. in a habitual and longstanding manner

    Synonyms : chronically
  2. habitual

    Synonyms : chronic

intrepid

  1. invulnerable to fear or intimidation

    Synonyms : audacious, brave, dauntless, fearless, hardy, unfearing
    Examples :
    • intrepid pioneers

intransigence

  1. the trait of being intransigent; stubbornly refusing to compromise

    Synonyms : intransigency
    Type Of : bullheadedness, obstinacy, obstinance, pigheadedness, self-will, stubbornness

intermittent

  1. stopping and starting at irregular intervals

    Examples :
    • intermittent rain showers

interminable

  1. tiresomely long; seemingly without end

    Synonyms : endless, eternal
    Examples :
    • an interminable sermon

insurgent

  1. in opposition to a civil authority or government

    Synonyms : seditious, subversive
  2. a member of an irregular armed force that fights a stronger force by sabotage and harassment

    Synonyms : guerilla, guerrilla, irregular
    Type Of : warrior
  3. a person who takes part in an armed rebellion against the constituted authority (especially in the hope of improving conditions)

    Synonyms : freedom fighter, insurrectionist, rebel
    Type Of : crusader, meliorist, reformer, reformist, revolutionary, revolutionist, social reformer, subversive, subverter

instigator

  1. someone who deliberately foments trouble

    Synonyms : firebrand, inciter, instigant, provoker
    Type Of : mischief-maker, trouble maker, troublemaker, troubler, bad hat
    Examples :
    • she was the instigator of their quarrel
  2. a person who initiates a course of action

    Synonyms : initiator
    Type Of : leader

instigate

  1. provoke or stir up

    Synonyms : incite, set off, stir up
    Type Of : stimulate, provoke
  2. serve as the inciting cause of

    Synonyms : inspire, prompt
    Type Of : make, get, induce, stimulate, have, cause

insipid

  1. lacking taste or flavor or tang

    Synonyms : bland, flat, flavorless, flavourless, savorless, savourless, vapid
    Examples :
    • insipid hospital food
  2. lacking interest or significance or impact

    Synonyms : jejune
    Examples :
    • an insipid personality

insentient

  1. devoid of feeling and consciousness and animation

    Synonyms : insensate
    Antonyms : sentient
    Examples :
    • insentient (or insensate) stone