knotty
knot-ty
adjective
Having many knots, especially in wood, making it rough or gnarled.
"The carpenter struggled with the knotty piece of timber."
adjective
Complex and difficult to solve or understand; intricate and perplexing.
"The team faced a particularly knotty ethical dilemma."
Thesaurus
Synonyms: knobbed, gnarled, gnarly, knotted, crooked, involved, complex, tortuous, Byzantine, tangled, convoluted, labyrinthine