influence and authority
informed and competent
ingenious and eloquent
ingratitude and cruelty
inharmonious and irregular
injustice and inhumanity
innocence and fidelity
innuendo and suggestion
inopportune and futile
insanely and blindly
inscrutable and perplexing
insecurity and precariousness
insensibly and graciously
insignificant and transitory
insincere and worthless
insipid and silly
insistent and incongruous
insolence and absurdity
inspiring and animating
instant and momentous
instinctive and rational
insulted and thwarted
intangible and indefinable
integral and indestructible
integrity and honor
intelligence and insight
intense and overpowering
intentness and interest
interesting and engrossing
intimate and familiar
intolerant and bumptious [bumptious = loudly assertive; pushy]
intractable and untameable
intricate and endless
intrusive and unmannerly
intuitive and axiomatic
invasion and aggression
invective and innuendo [invective = abusive language]
investigation and research
invidious and painful [invidious = rousing ill will, animosity]
inviolate and unscathed
invisible and silent
involuntary and automatic
irksome and distasteful
irrational and excessive
irregular and intermittent
irreligious and immoral
irremediable and eternal
irrepressible and insistent
irreverence and ingratitude
irritable and churlish [churlish = boorish or vulgar]