1. He used to have an sloppy appearance. After several failed attempts to ask a girl out, he finally learned his lesson and cleaned up his appearance.2. The artist has a bohemian appearance and spends all his time painting.
 Not care how one looks sloppy appearance untidy appearance a bohemian appearancesloppy 很貼切，untidy 指不大整潔的外表，bohemian 是藝術家氣質的外表，也可說不修邊幅，並不會不整潔。
他之前往往不修邊幅, 後來經過多次跟女生約會失敗後總算學到教訓, 開始整理自己的儀容了
I tried to explain how the software works to my dad, but he is low on the uptake.