'insensitively-formed' originates from the combination of 'insensitive' and 'formed', where 'in-' is a prefix meaning 'not', and 'sensitive' comes from Latin 'sensitivus', meaning 'capable of feeling'.

'insensitive' changed from the Latin word 'insensitivus' and eventually became the modern English word 'insensitive'.

Initially, 'insensitive' meant 'not capable of feeling', but over time it evolved into its current meaning of 'lacking consideration for others' feelings'.