indirect
Word family
- indirectlyadverbB2
- indirectnessnounC1
Synonym discussion
Sense: adjective/1
All four words describe something that is not the main or primary effect, but they differ in nuance. 'Indirect' focuses on the chain of causation: the result is one or more steps removed from the cause, but still connected. 'Secondary' emphasises rank or importance — a secondary effect matters less than the primary one, but it may be directly caused. 'Incidental' suggests something that happens by chance alongside a main activity; it feels more accidental and less causally connected than 'indirect'. 'Collateral' is the most formal and specific, often used in technical or legal contexts (e.g. 'collateral damage' in military language), carrying a sense of unavoidable side effects. In everyday use, 'indirect' is the broadest and most neutral choice. For example, you would say 'the indirect effects of the new law on small shops', but you would not say 'the collateral effects' unless writing a formal report.
Common collocations
Etymology
The word comes from Latin 'indirectus', formed by adding the negative prefix 'in-' (meaning 'not') to 'directus' (meaning 'straight, direct'). It entered English in the late Middle Ages, originally used for physical paths and courses, later extended to figurative meanings about causation and communication.