effley is mischievous, lazy, paranoid, arrogant, and dishonest. He is known to become jealous easily. He also tends to be a poor friend, something even he agrees with. ... This is because Greg has a tendency for getting himself and Rowley into trouble.
Greg is an adolescent who struggles with his image and identity throughout his middle school career. This shows over time within the numerous books as he tends to blame others for his problems while also lashing out on his closest and only friend, Rowley Jefferson. Gregory also tends to have a pessimistic outlook on life, and rather than looking at things from a logical perspective, he tends to act emotional and cause difficult situations to become worse due to his preconceived outlooks on life. His poor decisions also contribute to this. Greg is evidently insecure, and in the first few books (the first two if I remember correctly), he continues to regret having a diary and his attitude towards others caused by his insecurities continues to grow in an unhealthy way. His relationship with his brother Rodrick is almost never stable, and he does not view his family in a healthy way. The person he is closest to in his family is probably his dad. Overall though, Greg does act like an immature, pubescent child, who is slightly maturing and learning over time. While he may not entirely grasp his mistakes or the concepts each situation he faces brings, he acknowledges that he has made mistakes, and there has been times where he's tried to correct them.
You didnt provide the second sentence but from my understanding the prefix "un" , which means not, could be added to friendly to mean unfriendly or not friendly.
