'morally-opposed' originates from the combination of 'moral' and 'oppose', where 'moral' is derived from Latin 'moralis', meaning 'pertaining to manners', and 'oppose' from Latin 'opponere', meaning 'to set against'.

'moralis' transformed into the Old French 'moral', and 'opponere' became 'opposer' in Old French, eventually forming the modern English term 'morally-opposed'.

Initially, 'moral' meant 'pertaining to manners', and 'oppose' meant 'to set against'. Over time, 'morally-opposed' evolved to mean having a strong ethical objection.