1. in a way that is unlikely to be true or to happen
2. in a way that seems too strange or unusual to be believable

Examples

• The team improbably won the championship despite being ranked last.
• She improbably managed to finish the marathon after spraining her ankle.
• The story was improbably complex for a children’s book.
• He improbably claimed to have met three celebrities in one day.
• The small town improbably became a major tourist destination.
• The experiment improbably produced results that contradicted all previous studies.