Similar words
schmutzig
Dreckig is more colloquial and coarse; schmutzig is the neutral, standard word for dirty.
Similar in other languages
Portuguese
sujo
sujo is the Portuguese word for the same thing — both mean "dirty."
Practice
1 What does dreckig mean?
dirty
2 Fill the gap: Deine Schuhe sind ___.
Full sentence: Deine Schuhe sind dreckig. (Your shoes are dirty.)
3 Which fingerprint chart matches dreckig?
dreckig: neutral register, common frequency, general domain, neutral connotation.