When looking for synonyms for "warranteed," words such as guaranteed, certified, and secured might come to mind. Other options might include warranted, backed, or ensured. These words all convey a sense of protection or assurance that a particular product or service will meet a certain level of quality or performance. Depending on the context, words like supported, validated, or authorized might also be appropriate synonyms for "warranteed." It's important to choose the right synonym for the situation and to make sure it accurately reflects what you're trying to convey.