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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