Synonyms:
- Byzantine,
- Herculean,
- abstruse,
- arduous,
- beyond one,
- brutal,
- burled,
- complex,
- complicated,
- crabbed,
- cramp,
- critical,
- daedal,
- delicate,
- demanding,
- difficile,
- difficult,
- effortful,
- elaborate,
- exacting,
- formidable,
- garbled,
- gnarled,
- gnarly,
- gordian,
- hairy,
- hard,
- hard to understand,
- hard-earned,
- hard-fought,
- intricate,
- involved,
- jawbreaking,
- jumbled,
- knobbed,
- knobbly,
- knobby,
- knoblike,
- knotted,
- knurled,
- knurly,
- laborious,
- labyrinthine,
- lumpy,
- mean,
- no picnic,
- nodal,
- noded,
- nodiform,
- nodose,
- nodular,
- nodulated,
- noduled,
- not easy,
- nubbled,
- nubbly,
- nubby,
- obfuscated,
- obscure,
- obscured,
- operose,
- overtechnical,
- perplexed,
- rigorous,
- rough,
- rugged,
- scrambled,
- set with thorns,
- severe,
- sophisticated,
- spiny,
- steep,
- sticky,
- strenuous,
- studded,
- terrible,
- thorny,
- ticklish,
- toilsome,
- torose,
- tough,
- tricky,
- tubercular,
- tuberculous,
- tuberose,
- tuberous,
- uphill,
- wicked