immaturity
acting younger than one's age; childishness
immodest
not shy or modest, but, rather, bold
impassive
not showing emotion
imperfection
a mistake or flaw
impersonal
not aimed at a particular person; lacking warmth
implausible
not believable
improvisation
a performance given without any preparation
incapable
not able or qualified to do something
incognito
with one's identity hidden; disguised
incongruity
something that is out of place or not in character
inconvenience
something that requires extra effort or causes trouble
infinite
without end or limit
insignificant
not important
invincible
not able to be defeated
irrational
without reason or sound judgment
irrelevant
not bearing on the subject at hand
irreparable
not able to be repaired; ruined
irresolute
not able to make up one's mind
irresponsibility
not being reliable; untrustworthy
irreverent
not respectful
immaturity
acting younger than one's age; childishness
immodest
not shy or modest, but, rather, bold
impassive
not showing emotion
imperfection
a mistake or flaw
impersonal
not aimed at a particular person; lacking warmth
implausible
not believable
improvisation
a performance given without any preparation
incapable
not able or qualified to do something
incognito
with one's identity hidden; disguised
incongruity
something that is out of place or not in character
inconvenience
something that requires extra effort or causes trouble
infinite
without end or limit
insignificant
not important
invincible
not able to be defeated
irrational
without reason or sound judgment
irrelevant
not bearing on the subject at hand
irreparable
not able to be repaired; ruined
irresolute
not able to make up one's mind
irresponsibility
not being reliable; untrustworthy
irreverent
not respectful