When it comes to finding antonyms for the phrase "were partial to," we can start by exploring words that connote neutrality, impartiality, or indifference. Some potential choices could be "unbiased," "impartial," "unprejudiced," or "disinterested." These words suggest a lack of preference or favoritism, in contrast to the sense of affection or attraction implied by being "partial to" something or someone.
Additionally, antonyms could be words that suggest active dislike or opposition rather than neutrality. For instance, synonyms for "dislike" or "hate" could be appropriate, such as "detest," "abhor," or "loathe." These words suggest a strong negative feeling, in contrast to the relatively positive connotation of being "partial to" something.