dirt; filth; grime

accumulated dirt, filth, or muck on a surface or skin

having messy hair and a dirty face; describing a disheveled or filthy appearance

to hide dirt or conceal corruption and moral filth

limescale; scale (in a kettle or pipe)

dental plaque or tartar; buildup of food and bacteria on teeth

greasy dirt

deeply accumulated filth

to hide dirt, grime, or harbor corrupt practices and social impurities

with disheveled hair and a dirty face; of messy or neglected appearance

to bear shame and humiliation

dried nasal mucus

to bear humiliation to save one's skin

to search for flaws or faults intentionally; to find fault with someone even in the absence of obvious errors

pure of heart; innocent and unsullied

tea stain (on the inside of a teapot, teacup, etc.)