I
- Iconoclast – a person who destroys religious images or who attacks settle beliefs or institutions
- Idiosyncrasy – eccentric
- Idyllic – simple, charmingly carefree
- Imbibe – to absorb
- Imbroglio – complicated situation
- Imbue – saturate, fill
- Impair – injure, hurt
- Impale – pierce
- Impasse – a situation in which no progress is possible
- Impending – approaching, nearing
- Imminent – forthcoming, about to happen
- Imperious – arrogant, dominating
- Impeccable – faultless
- Impervious – impenetrable
- Impetuous – violent
- Impetus – moving force, stimulus
- Impinge – infringe, touch ,collide with
- Implausible – unlikely, unbelievable
- Impolitic – not wise
- Importunate – urging, demanding
- Imposture – assuming a false identity
- Imprecation – curse
- Impropriety – improperness, unsuitable
- Improvident – incautious, not thinking about o planning for future, spending money in careless way.
- Impudence – lacking modesty, disrespect
- Impuissance – powerlessness
- Incarcerate – imprison
- Incense – infuriate, enrage
- Inchoate – elementary, recently begun
- Incipient – beginning in an early stage
- Incubus – burden, mental care, nightmare
- Incursion – temporary invasion
- Indict – charge with crime
- Indigence – poverty
- Inevitable – unavoidable
- Indignation – anger at an injustice
- Infraction – violation
- Ingratiate – become popular with
- Ingenuous – Naïve, honest, innocent
- Inimical – unfriendly, hostile, harmful
- Inquisitor – investigator, questioner
- Inscrutable – not readily understood, mysterious
- Insidious – tricky, crafty, subtle, cunning
- Insipid – lacking in flavor, dull, unexciting
- Insouciant – indifferent, without concern or care
- Instigate – provoke
- Insuperable – unbeatable
- Intractable – unruly, stubborn, unyielding
- Intransigent – inflexible
- Inundate – overwhelm, overpower
- Inveigh – speak or write about something with great hostility, protest
- Irate – angry
- Irksome – tedious, annoying
- Itemize – to produce detailed list of thinks
