| Subject | English | Spanish |
| UN, AIDS. | unsafe behaviour | comportamiento peligroso |
| UN, AIDS. | unsafe behaviour | comportamiento de riesgo |
| UN, AIDS. | unsafe blood | sangre poco segura |
| comp., MS | unsafe character | carácter no seguro (A character in a URL that may be altered during transport across the Internet) |
| comp., MS | unsafe code | código no seguro (Code that is executed directly by the operating system, outside the .NET Framework common language runtime. Unmanaged code must provide its own memory management, type checking, and security support, unlike managed code, which receives these services from the common language runtime) |
| UN, AIDS. | unsafe drug injecting | inyección peligrosa de drogas |
| food.serv. | unsafe food | alimento no inocuo |
| food.serv. | unsafe food | alimento nocivo |
| UN, AIDS. | unsafe sex unprotected sex | relaciones sexuales peligrosas |
| UN, AIDS. | unsafe sex unprotected sex | prácticas sexuales peligrosas |
| water.res. | unsafe water | agua impura |
| water.res. | unsafe water | agua no apta para el consumo |