KanjiJLPT N1
Vulgar

vulgar, customs, manners, worldliness, mundane things

Mnemonic

Butler Alfred descended into the valley for errands, only to find the most vulgar scene—crude vendors spitting, belching, shouting profanities. Alfred recoiled in horror, clutching his gloves. 'This valley has no class,' he muttered, fleeing uphill in disgust.
Additional thoughts
Picture Alfred in his pristine suit descending into a grimy valley teeming with crude, common folk. The sharp contrast between his refinement and the valley's coarseness captures Vulgar perfectly. Butler + Valley = Vulgar.
Quick recall
Butler Alfred finds the valley marketplace unbearably vulgar.

Details

The keyword for 俗 is vulgar. This kanji refers to what is common, worldly, or lacking in refinement, standing in contrast to the sacred, elegant, or cultivated. It encompasses the idea of popular customs, secular life, and the ordinary ways of the masses. By extension, it can carry a negative connotation of being crude, tasteless, or base in character.
On'yomi
ぞく