interwoven thread
intimately allied
intolerably tedious
intoxicating hum
intractable temper
intrenched privilege
intrepid dexterity
intricate interlacings
intriguing braggart
intrinsic fecundity [fecundity = productive or creative power]
intrusive brightness
intuitive perception
invaluable composition
invariable kindness
inveighing incessantly [inveighing = angry disapproval]
inventive jealousy
inveterate antipathy
invidious mention [invidious = rousing ill will or resentment]
invigorating discipline
invincible optimism
inviolable confidence
involuntary yearnings
involuted sentences [involuted = intricate; complex]
involved pomposity
invulnerable solemnity
inward disinclination
irascible doggedness
irate remonstrance
iridescent sheen
irksome task
iron resolution
ironic iciness
irradiating spirit
irrational awe
irreclaimable dead
irreconcilable parting
irrecoverably lost
irrefragable laws [irrefragable = indisputable]
irrefutable argument
irregular constellations
irrelevant suggestion
irremediable sorrow
irreparable injury
irrepressible excitement
irreproachable exterior
irresistible will
irresponsible gossip
irretrievable blunder
irreverent audacity
irreversible facts