Causative/ˈkɔːzətɪv/ Definition 1 of 2Pro Tip 1/3Look for Cause Use 'causative' to point out what is making something else happen. Smoking is a causative factor in lung cancer. Pro Tip 2/3Imply Responsibility 'Causative' implies something is responsible for an effect or outcome. A virus is the causative agent of the flu. Pro Tip 3/3Identify the Source Use 'causative' when identifying the source of a problem or condition. Poor diet can be a causative factor in health issues.