'rigorously-managed' originates from the combination of 'rigorous' and 'manage', where 'rigorous' comes from Latin 'rigor', meaning 'stiffness', and 'manage' from Italian 'maneggiare', meaning 'to handle'.

'rigorously-managed' evolved from the combination of 'rigorous' and 'manage', which were used separately in Middle English and later combined in modern English.

Initially, 'rigorous' meant 'stiff or unyielding', and 'manage' meant 'to handle or control'. Over time, they combined to describe something managed with strict precision.