Unwritten/ˌʌnˈrɪtn/ Definition 1 of 3Pro Tip 1/3Mental Checklist Used for thoughts or plans not yet documented. He kept his business strategy unwritten to stay flexible. Pro Tip 2/3Implicit Understanding Implies something everyone knows but has not formalized. The team followed an unwritten rule to start meetings on time. Pro Tip 3/3Open to Interpretation Allows personal interpretation due to lack of specificity. Their friendship was based on an unwritten mutual respect.