'shaky' originates from the word 'shake,' which comes from Middle English 'shaken,' derived from Old English 'sceacan,' meaning 'to move quickly or vibrate.'

'sceacan' transformed into the Middle English 'shaken,' and eventually became the modern English word 'shake,' from which 'shaky' is derived.

Initially, it meant 'to move quickly or vibrate,' but over time it evolved into its current meaning of 'unsteady or unstable.'