1. ideology:
principles, convictions, tenets, philosophy
2. idyllic:
heavenly, paradisaic(al), Edenic, halcyon
3. illusory:
illusive, imaginary, fictional, unreal, untrue
4. illustrious:
distinguished, famous, noted, renowned, famed, eminent
5. immaculate:
spotless, stainless, unblemished, pure, clean
6. immense:
enormous, gigantic, extensive, vast, huge, massive
7. imminent:
impending, looming, threatening, menacing
8. immune:
protected, safe, inoculated, vaccinated, exempt
9. impair:
weaken, cripple, damage, harm, mar, injure
10. impassive:
cool, apathetic, calm, serene, composed, unmoved
11. impeach:
charge, accuse, arraign, indict, incriminate, implicate
12. imperative
mandatory, compulsory, necessary, required, requisite
13. imperceptible:
undetectable, invisible, indiscernible, indistinguishable, obscure, vague
14. impertinence:
insolence, boldness, brazenness, impudence, presumption
15. implicate:
involve, include, associate, embroil, ensnare, entrap
16. implicit:
implied, indirect, inferable, understood, unspoken
17. impudent:
shameless, impertinent, insolent, disrespectful, forward
18. inadvertent:
accidental, unintentional, unintended, unpremeditated, unthinking
19. incapacitate:
disable, cripple, paralyse, lame, wound, maim, impair
20. incongruous:
inconsistent, inharmonious, disharmonious, discordant
21. indigent:
needy, poor, destitute, poverty-stricken, in want
22. indolence:
laziness, slothfulness, sloth, sluggishness, idleness
23. infatuated:
fascinated, beguiled, enchanted, bewitched, spellbound
24. ingenious:
clever, skilful, skilled, shrewd, cunning, crafty, canny
25. ingenuous:
naive, simple, innocent, unsophisticated, childlike, suggestible