An accidental injury is an unfortunate event that can happen to anyone unexpectedly. If you are looking for alternative words to replace this phrase, some of the possible synonyms are unforeseen harm, unintentional wound, inadvertent damage, sudden trauma, unintentional hurt, or unexpected impairment. Other possible options include chance injury, coincidental harm, fortuitous damage, serendipitous trauma, or coincident impairment. These synonyms can be used interchangeably with accidental injury to describe any injuries that occur without intent or purpose. It's important to note that no matter what phrase is used, accidental injuries can be physically and emotionally distressing, and it's essential to seek medical attention when they occur.