insolent

Someone who's insolent is either really doing her own thing, even if it goes against what everyone else is doing, or she’s mildly disrespectful.

That student in your class who is constantly snubbing the teacher, snorting when he gives assignments, and rolling her eyes when he reads passages aloud from your vocabulary textbook? Insolent, definitely insolent. There might be another student who adorns her school uniform with pins and ribbons, cuts her hair shorter than the dress code allows, and rolls her socks down. This student is also insolent, in the sense that she defies the rules.

Definitions of insolent
1

adj marked by casual disrespect

Synonyms:
flip, impudent, snotty-nosed
disrespectful
exhibiting lack of respect; rude and discourteous

adj unrestrained by convention or propriety

“"the modern world with its quick material successes and insolent belief in the boundless possibilities of progress"- Bertrand Russell”
Synonyms:
audacious, bald-faced, barefaced, bodacious, brassy, brazen, brazen-faced
unashamed
used of persons or their behavior; feeling no shame

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