Synonyms of knottier

1 Syllable

hard, tough, rough

2 Syllables

puzzling, thorny, mazy, complex, baffling, rugged, gordian, tricky, sticky, uphill

3 Syllables

involved, nodulous, terrible, mystifying, perplexing, effortful, ramified, difficult

4 Syllables

intricate, formidable, complicated, reticular

5 Syllables

sophisticated, labyrinthine, problematical, elaborate