ボサボサruffled (hair, brush bristles, etc.), unkempt, dishevelled, untidy, tousled, idling away time, dawdling, dilly-dallying

ボサボサの髪(かみ)をブラシで整(ととの)える。

Tidying up the unkempt hair with a brush. {ruffled (hair, brush bristles, etc.), unkempt, dishevelled, untidy, tousled, idling away time, dawdling, dilly-dallying}

ボサボサしていないで仕事(しごと)をしなさい！

Stop dilly-dallying and get to work! {ruffled (hair, brush bristles, etc.), unkempt, dishevelled, untidy, tousled, idling away time, dawdling, dilly-dallying}

先生(せんせい)：「授業(じゅぎょう)中(ちゅう)にボサボサしていると落第(らくだい)するぞ！」

Teacher: "If you're dilly-dallying during class, you'll fail!" {ruffled (hair, brush bristles, etc.), unkempt, dishevelled, untidy, tousled, idling away time, dawdling, dilly-dallying}

ボサボサの頭(あたま)で会社(かいしゃ)に来(く)るのは常識(じょうしき)的(てき)にありえない事(こと)です。

Coming to the office with unkempt hair is something that is simply not acceptable in terms of common sense. {ruffled (hair, brush bristles, etc.), unkempt, dishevelled, untidy, tousled, idling away time, dawdling, dilly-dallying}

せっかく髪(かみ)をセットしたのに、強風(きょうふう)のせいでボサボサになってしまった。

Despite going to the trouble of styling my hair, it ended up getting tousled because of the strong wind. {ruffled (hair, brush bristles, etc.), unkempt, dishevelled, untidy, tousled, idling away time, dawdling, dilly-dallying}