'biologically-unsuited' originates from the combination of 'biological,' which comes from the Greek word 'biologikos,' meaning 'pertaining to biology,' and 'unsuited,' which is derived from the prefix 'un-' meaning 'not,' and 'suited,' from the Latin 'suitare,' meaning 'to make suitable.'

'biologically-unsuited' changed from the combination of 'biological' and 'unsuited' in modern English to describe a lack of natural adaptation.

Initially, it meant 'not naturally adapted,' and this meaning has largely remained the same in modern usage.