famous 出名的好。是一个褒义词。
famous
*['feimәs]
a. 出名的, 极好的
<— 牛津现代英汉双解词典 —>
/ˈfeɪməs; `feməs/ adj 1 ~ (for sth) known to very many people; celebrated 出名的; 着名的: Paris is a famous city. 巴黎是着名的城市. * New York is famous for its skyscrapers. 纽约以其摩天大楼驰名. * She is famous as a writer. 她是着名的作家. 2 (dated infml 旧, 口) excellent 极好的: We’ve won a famous victory. 我们赢得了辉煌的胜利. 3 (idm 习语) famous last words (joc catchphrase 谑, 警语) (said when sb has made an important, optimistic, etc statement which may turn out to be untrue and which he may regret saying 有人说出重要的、胸有成竹之类的话, 但却可能不确而使说话的人自觉悔不该言, 此时用此词组).
infamous；这个算是一个反义词，因为加了前缀-in；坏的出名
*['infәmәs]
a. 无耻的, 不名誉的, 声名狼藉的；
<— 牛津现代英汉双解词典 —>
/ˈɪnfəməs; `ɪnfəməs/ adj 1 ~ (for sth) well-known as being wicked or immoral; notorious 声名狼藉的; 恶名昭着的: an infamous traitor 臭名昭彰的叛徒 * a king infamous for his cruelty 以残暴而臭名远扬的国王. 2 (fml 文) wicked; disgraceful 邪恶的; 无耻的; 丢脸的: his infamous treatment of her 他对她恶毒的虐待.
但是，对于famous 的普遍意识里的反义词应该是“不出名”，或者说是普通？所以这个例子算是超出普遍意识的一个例子。