悪習[akushuu] bad habit
悪習慣[akushuukan] bad habit
演習[enshuu] practice
演習問題[enshuumondai] practice problem
演奏練習[ensourenshuu] musical rehearsal

学習[gakushuu] study
学習者[gakushuusha] learner
学習塾[gakushuujuku] private night-school
学習用[gakushuuyou] tutorial
学習用ヘルプ[gakushuuyouherupu] tutorial help

固陋[korou] stubbornly sticking to old ways
卑陋[hirou] low rank
陋劣[rouretsu] mean
陋巷[roukou] narrow, dirty backstreet
陋屋[rouoku] cramped home

陋習[roushuu] evil custom
頑迷固陋[ganmeikorou] obstinate
狷介固陋[kenkaikorou] stubbornly sticking to old ways
固陋頑迷[korouganmei] obstinate
頑陋[ganrou] stubborn and mean