grainedyoudaoicibaDictYouDict[grained 词源字典]
in compounds, "having grains" (of a specified kind), 1520s; see grain (n.).[grained etymology, grained origin, 英语词源]
hare-brained (adj.)youdaoicibaDictYouDict
also harebrained, 1540s, from hare-brain "giddy or reckless person" (1540s), probably from hare (n.), on notion of "flighty, skittish."
restrained (adj.)youdaoicibaDictYouDict
"repressed, kept under control," 1570s, past participle adjective from restrain.
unconstrained (adj.)youdaoicibaDictYouDict
1640s, from un- (1) "not" + past participle of constrain (v.). Related: Unconstrainedly.
unrestrained (adj.)youdaoicibaDictYouDict
1580s, from un- (1) "not" + past participle of restrain (v.). Related: Unrestrainedly.
untrained (adj.)youdaoicibaDictYouDict
1540s, from un- (1) "not" + past participle of train (v.).