What are the connotations of excuse?

Language Connotation is the tone or emotional association that a word has. It can be negative or positive, but is usually something seen by the population in general. For example, "slim" and "bony"...

A connotation is your emotions to a word. For example, murder. When we think of murder, we think of it as a bad thing, so it has a negative connotaion.

Technically, "they have no excuses" is correct because they is a plural pronoun. In speech, you'll hear more people say "they have no excuse", but this is incorrect in light of grammar rules.

It is a negative word. Meaning negative, dreary, sad, etc.

Something people use to remove the blame from them to make themselves look good