shaky (adj.)youdaoicibaDictYouDict[shaky 词源字典]
1840, of handwriting; 1841 of persons, horses, and credit; 1850 of structures; from shake (v.) + -y (2). General sense of "uncertain, of questionable integrity" is from 1834. Earliest of trees or logs, "split, having fissures" (1808). Related: Shakily; shakiness.[shaky etymology, shaky origin, 英语词源]