ISN'T PERFECT' The crossword solution for the term 'ISN'T PERFECT' is ERRS, which is an abbreviation of the verb 'to err'. To err means to make a mistake or do something wrong, and is often used in the phrase 'to err is human', which implies that it is natural for humans to make mistakes. Therefore, the phrase 'ISN'T PERFECT' can be interpreted as meaning that something is not perfect because it has been made by humans and is therefore prone to errors.