The molester acquires sick knowledge in his CHEESY exploits.
Usually 漢 means Chinese: it's used in a lot of obscure words ('Chinese dictionary,' 'Chinese herbal medicine,' 'Chinese classical literature,' etc.)
HOWEVER - aside from 漢字 - the only time 漢 is really used in daily life is here: 痴漢, meaning a guy who molests or gropes women on crowded trains.
So the literal reading is: 'sick Chinese' !WTF???
|ｘｘｘ 音痴 である||
terrible at --xxx
literally, to be tone-deaf, unable to carry a tune. But you can also say, 方向音痴, which means 'to have no sense of direction,to get lost a lot.' One more idiom: 運動音痴: (undou onchi) means terrible at sports.
grumble or mutter a complaint over and over - to bitch, whine, grouse, sing the blues. (as opposed to 文句 (もんく) which means make a loud and articulate complaint)
愚痴 文句 クレイム 苦情