Improbable/ɪmˈprɑːbəbl/ Definition 1 of 1Pro Tip 1/3Degree of Unlikelihood Indicates the subject is possible but occurrences are rare or unexpected. Winning the lottery is improbable, but still imaginable. Pro Tip 2/3Contextual Strength Varies in strength; 'highly improbable' is stronger than just 'improbable'. Encountering a dinosaur in the wild is highly improbable. Pro Tip 3/3Objective Judgment Shows an objective assessment rather than a personal opinion. Given the evidence, his innocence seems improbable.