- in the scud
- in short order
- ince-ssantly
- imprimatur
- idolized
- in a good mood
- informal pretty much
- incorrupt
- instantane-ous
- in the matter of
- incomings
- in the sticks
- illy-whacker
- in the nuddy
- in days of yore
- in many cases
- in a bad way
- incorruptibility
- incumbency
- irregligious
- impressiveness
- itsy-bitsy
- in double quick time
- in time of yore
- in plenty
- itemized
- in a dither
- interdicted
- in rude health
- ire-versible
- in the back-blocks
- in big
- in many instances
- in good shape
- in ancient Rome circus
- irreconci-lable
- innovators
- intransigence
- ill-conceived
- in the ballpark of
- in flap
- in the tall timbers
- itch for
- in abundance
- iniquitous nefarious
- in good trim
- invalided
- itty-bitty
- in Queer Street
- incomprehensible
- in jig time
- in a huff
- in a tiz-woz
- indefatigability
- incurvation
- in a blue funk
- in a state
- in fine fettle
- in transports of delight
- in a cold sweat
- in the boondocks
- ill-thought-out
- informal you got it
- insightful
- in a lather
- in a tiz
- in trim
- intrinsically
- in one's best interests
- inherently
- in low spirits
- in a tizz
- in a split scond
- informl chuck up
- in a tizzy
- interstate
- in-effectual
- ickle
- in double-quick time
- illywhacker
- in the twinkling of an eye
- in every way
- in no time at all
- in left field
- instanter
- in a paddy
- in every respect
- in a stew
- in a twitter
- in the bag
- is that a fact
- I never did
- I'll be blowed
- in a twit