Etymology
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grubby (adj.)

"dirty," by 1845, from grub (n.) in a sense of "dirty child" (who presumably got that way from digging in earth) + -y (2). Earlier it was used in a sense of "stunted, dwarfish" (1610s) and "infested with grubs" (1725). Related: Grubbily; grubbiness.

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Definitions of grubby
1
grubby (adj.)
infested with grubs;
grubby (adj.)
thickly covered with ingrained dirt or soot;
grubby little fingers
Synonyms: begrimed / dingy / grimy / grungy / raunchy
2
grubby (n.)
small sculpin of the coast of New England;
Synonyms: Myxocephalus aenaeus
From wordnet.princeton.edu