If a person or thing is non-judgmental, they do not judge or criticize.

a non-judgmental book/counsellor 一本不加评论的书／一位不做评价的律师

The organization provides a 24 hour, non-judgmental listening service for people who are considering suicide. 这个慈善组织为有自杀倾向的人提供24小时的电话倾听服务，职员都不加批判。