The phrase 'kept safe' means to protect or preserve one's welfare, security, or well-being from external harm. The opposite of this phrase can be 'left vulnerable' or 'exposed to danger.' By not being protected, people or things are at risk of harm or damage. Other antonyms for the term 'kept safe' can be 'endangered,' 'at risk,' 'insecure,' 'exposed,' 'unprotected,' 'compromised,' or 'threatened.' Disregarding protection measures can lead to disastrous consequences, both in personal and professional situations. Thus, it is essential to ensure that everything is secure and 'kept safe' to avoid unfavorable results.