'leisurely-grown' originates from the combination of 'leisurely' and 'grown', where 'leisurely' means 'acting or done at leisure; unhurried or relaxed' and 'grown' is the past participle of 'grow'.

'leisurely' comes from Middle English 'leiserly', and 'grown' is derived from Old English 'grōwan'.

Initially, 'leisurely' meant 'at one's own time', and 'grown' meant 'to increase in size'. Together, they convey the idea of something that has developed slowly over time.