indirect has 1 distinct synonym spread across 1 of its 5 senses. 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 direct.
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.
not direct in spatial dimension; not leading by a straight line or course to a destination
“sometimes taking an indirect path saves time”
descended from a common ancestor but through different lines
“cousins are collateral relatives”
extended senses; not direct in manner or language or behavior or action
“making indirect but legitimate inquiries”
2 of the 5 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for indirect.
Synonyms, antonyms and the broader and narrower relations for indirect come from Princeton University’s WordNet. Full sources and licences.