'strongly-attached' originates from the combination of 'strongly' and 'attached', where 'strongly' is derived from 'strong', meaning 'having great power or force', and 'attached' from 'attach', meaning 'to fasten or join'.

'strongly-attached' evolved from the Middle English word 'attachen', which came from the Old French 'atachier', eventually forming the modern English term 'attached'.

Initially, 'attach' meant 'to fasten or join', and over time, 'strongly-attached' evolved to mean 'having a firm or intense connection'.