furrowed has 1 distinct synonym spread across 1 of its 1 sense. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is unfurrowed.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
having long narrow shallow depressions (as grooves or wrinkles) in the surface
“furrowed fields”
Synonyms, antonyms and the broader and narrower relations for furrowed come from Princeton University’s WordNet. Full sources and licences.