Undocumented/ˌʌnˈdɑːkjumentɪd/ Definition 1 of 4Pro Tip 1/3Law Enforcement Often related to instances involving police or government officials. The undocumented driver was asked for his license. Pro Tip 2/3Negative Associations Can imply something illegal or unauthorized, often with negative connotations. They operated an undocumented business. Pro Tip 3/3Uncertain Identity Used to describe someone or something whose identity can't be verified. The undocumented parcel was left unclaimed.