Bastardising is a term that refers to the act of corrupting or tainting something, or making it impure. There are several synonyms for this term, each with their own unique connotations. One such synonym is 'degrading', which refers to the act of lowering the value or quality of something. Another synonym is 'obscuring', which means making something unclear or hard to understand. Additionally, 'perverting' is another synonym that refers to the act of distorting or twisting something from its natural or intended state. Other synonyms for bastardising include 'tainting', 'polluting', 'sullying', and 'defiling', all of which describe the act of damaging or contaminating something in some way.