The term 'not very nice' can be described by a variety of words, such as MEAN, HARSH, RUDE, CRUEL, and baddish. MEAN is defined as unkind or spiteful, while HARSH is defined as severe or unkind. RUDE is defined as impolite or disrespectful, while CRUEL is defined as causing pain or suffering. Baddish is defined as slightly bad or naughty. All of these words describe the term 'not very nice' in that they all imply a lack of kindness or respect.