imperil and destroy
imperious and ruthless [imperious = arrogantly domineering]
impertinent and personal
impinging and inexorable
implacable and destructive
important and formidable
imposed and enforced
impossibilities and absurdities
impressible and plastic
improvement and progress
imprudent and thoughtless
impulse and indignation
inaccessible and audacious
inactive and supine
inadequate and misleading
inapplicable and alien
inarticulate and confused
inborn and native
incensed and alarmed
inchoate and tentative [inchoate = imperfectly formed]
incoherent and inconclusive
incompetence and ignorance
incomplete and erroneous
incongruity and absurdity
inconvenient and troublesome
incorrigible and irrepressible
incredulous and mortified
indefatigable and irresistible
indefinite and vague
independent and democratic
indifference and brevity
indigence and obscurity
indignation and chagrin
indirectly and unconsciously
indispensable and irreplaceable
indistinct and misty
indolence and indifference
indomitable and dogged
indorsed and applauded
indulge and cherish
industrious and vigilant
ineffective and bungling
inert and uncertain
inevitable and assured
inexhaustible and indomitable
inexperienced and timid
infallible and disdainful
inference and suggestion
infinite and eternal
inflexible and unchanging