Synonyms of 'invidious'
1 undesirableDictionary, unpleasant, hatefulHe's in the invidious position of having to break the bad news.
2 unfairDictionary, unjust, unjustifiedIt is invidious to make a selection.
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Someone who is hateful hates someone else.
They are not necessarily hateful, malicious people.
If you say that something is inequitable, you are criticizing it because it is unfair or unjust.
The system is grossly inequitable and inefficient.
If you describe an action, system, or law as unjust, you think that it treats a person or group badly in a way that they do not deserve.
campaigning against racist and unjust immigration laws
Thesaurus for invidious from the Collins English Thesaurus
If you describe a task or job as invidious , you mean that it is unpleasant because it is likely to make you unpopular .