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How should omission to act be rendered in Indonesian? This article tests four common candidates, namely kelalaian bertindak, keengganan bertindak, kegagalan bertindak, and ketiadaan tindakan, against the term's dictionary meaning and its role in the common law doctrine of the duty to act. It argues that omission denotes only the absence of an act, without implying reluctance, fault, or a breached duty. A bilingual indemnity clause shows how kelalaian bertindak can narrow the scope of a contract under Indonesian law. The article concludes that ketiadaan tindakan is the safest terminological equivalent and offers practical guidelines for choosing the right rendering in context.