Untimely end refers to a situation in which a person's life is cut short unexpectedly, usually due to disease, accident, or violence. It is a phrase that connotes a sense of tragedy and loss. There are various synonyms for the term, which include sudden death, premature demise, unexpected passing, and tragic fate. Each of these terms has a slightly different connotation and can be used in different contexts. However, they all express the idea of a life being cut short before its natural course, leaving behind a sense of mourning and sadness. Ultimately, the use of these synonyms depends on the tone and context of the situation.