1.
If you describe someone's behaviour, beliefs, or customs as unorthodox, you mean that they are different from what is generally accepted.
She spent an unorthodox girlhood travelling with her father throughout Europe...
His methods were unorthodox, and his lifestyle eccentric.
= unconventional
? orthodox
ADJ
2.
If you describe ways of doing things as unorthodox, you are criticizing them because they are unusual or illegal.
The charity says the journalists appear to have obtained confidential documents in an unorthodox manner.
? orthodox
ADJ [disapproval]