Antonym of ARROGANT

Arrogant : having or revealing an exaggerated sense of one's own importance or abilities.
Proud : feeling deep pleasure or satisfaction as a result of one's own achievements, qualities, or possessions or those of someone with whom one is closely associated.
Meek : quiet, gentle, and easily imposed on; submissive.
Insolent : showing a rude and arrogant lack of respect.
Rude : offensively impolite or bad-mannered.

Antonym of Arrogant is Meek