This is the 12574th most frequent Swedish word.
smutsig
Dirty.
Here 'smutsig' describes the condition of the dog being dirty due to mud.
Hunden blev smutsig efter att ha lekt i lerpölen.
The dog became dirty after playing in the mud puddle.
In this sentence, 'smutsigt' refers figuratively to indecent or inappropriate language.
Hans språk var smutsigt och opassande för situationen.
His language was dirty and inappropriate for the situation.
Here, 'smutsiga' modifies 'kläderna' to depict them being soiled due to outdoor activity.