adjective : untidy, unkempt
I like to tell myself that in times of quarantine strubbly hair is de rigueur.
Strubbly comes to English by way of Pennsylvania Dutch, a dialect of German spoken mainly in Amish communities primarily in Pennsylvania, Ohio, and Indiana. (Pennsylvania Dutch is also called "Pennsylvania German"; the “Dutch” in the former was influenced by deitsch, meaning “German.”)
The immediate ancestor of strubbly isn’t pronounceable to the uninitiated speaker of English: schtruwwlich. It has a somewhat more comprehensible relative in the Old High German strūben, meaning “to stand on end.” Like strūben, strubbly is most often used specifically of hair.