'ecologically-unsound' originates from the combination of 'ecological,' which comes from the Greek word 'oikos' meaning 'house' or 'environment,' and 'unsound,' which means 'not solid or firm.'

'Ecological' evolved from the Greek 'oikos' and 'logos,' meaning 'study of the house/environment,' while 'unsound' comes from Old English 'unsund,' meaning 'not healthy.'

Initially, 'ecological' referred to the study of environments, while 'unsound' meant unhealthy. Together, they now describe practices harmful to the environment.