stringiest

Stringiest is the superlative form of stringy, describing something that has the most fibrous, chewy, or thread-like quality among things being compared.

Food is often characterized this way—That was the stringiest piece of celery I've ever had—as are hair and other materials that form long, thin strands.

The word typically carries a negative connotation, suggesting an unpleasant texture or unkempt appearance.