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Irascible
easily provoked to anger; very irritable
Insipid
without distinctive, interesting, or stimulating qualities; vapid
Insolent
boldly rude or disrespectful; contemptuously impertinent; insulting
Intelligible
able to be understood; comprehensible
Invidious
(of an action or situation) likely to arouse or incur resentment or anger in others
Irreverent
showing lack of due respect or veneration
Jocund
cheerful; merry; gay; blithe; glad
Laudatory
(of speech or writing) expressing praise and commendation
Lugubrious
looking or sounding sad and dismal.
Mellifluous
(of a voice or words) sweet or musical; pleasant to hear
Mirthful
joyous; gay; jolly; arousing or provoking laughter
Misanthropic
disliking humankind and avoiding human society
Morose
sullen and ill-tempered
Nonchalant
coolly unconcerned, indifferent, or unexcited; casual
Nonplussed
totally puzzled, perplexed, or confused