英语词源字典 - 在线词源网站

hard-boiled (adj.)[hard-boiled 词源字典]: also hardboiled, 1723 in reference to eggs, "cooked so long as to be solid," from hard (adj.) + boiled. In transferred sense "severe, tough," from 1886.[hard-boiled etymology, hard-boiled origin, 英语词源]
spoiled (adj.): "over-indulged," 1640s, past participle adjective from spoil (v.).
unspoiled (adj.): c. 1500, "not plundered," from un- (1) "not" + past participle of spoil (v.). Meaning "not deteriorated" is attested from 1732. A verb unspoil is attested from c. 1400, but it meant "despoil."