The group of words that have strong negative connotations is inexpensive and mutt.
What is a negative connotation?
When people hear a term or phrase with a negative meaning, they get a terrible feeling or mood.
To prevent distorting the content of your work, be cautious when employing terms with negative connotations in your writing.
Words with the same meaning can evoke quite diverse emotions in different people.
Thus, the correct option is inexpensive and mutt.
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