Knotty

δυσεπίλυτος

dysepílytos

(complicated or tricky — see also complex, difficult)

δύσκολος

dýskolos

(complicated or tricky — see also complex, difficult)

οζώδης

ozódis

(of string or something stringlike: full of, or tied up, in knots)

πολύπλοκος

polýplokos

(complicated or tricky — see also complex, difficult)