'unreliably-manufactured' originates from the combination of 'unreliable' and 'manufactured', where 'unreliable' means 'not dependable' and 'manufactured' means 'produced or made'.

'Unreliable' comes from the prefix 'un-' meaning 'not' and 'reliable' from 'rely', while 'manufactured' comes from Latin 'manu factus', meaning 'made by hand'.

Initially, 'manufactured' meant 'made by hand', but now it refers to any production process, while 'unreliable' has consistently meant 'not dependable'.