英语词源字典 - 在线词源网站

self-serving (adj.)[self-serving 词源字典]: also self serving, 1827, from self- + serving, present participle adjective from serve (v.).[self-serving etymology, self-serving origin, 英语词源]
serving (n.): "action of serving," c. 1200, verbal noun from serve (v.). As "a helping of food" from 1769.
undeserving (adj.): 1540s, from un- (1) "not" + present participle of deserve (v.).
unswerving (adj.): 1690s, from un- (1) "not" + present participle of swerve (v.).
nervine: "(Of a medicine) used to calm the nerves", Mid 17th century: from medieval Latin nervinus 'of the nerves or sinews', or suggested by French nervin.
cervine: "Relating to deer; deer-like", Mid 19th century: from Latin cervinus, from cervus 'deer', + -ine¹.