"Most uncordial" means lacking warmth, kindness or friendliness. The antonyms for this phrase could be cordial, friendly, warm, hospitable, amiable, genial, affable, congenial, pleasant or agreeable. These words describe the opposite of the hostile attitude behind the term "most uncordial". People who are friendly and welcoming display a positive attitude towards others. On the other hand, those who are uncordial are more likely to be negative, unfriendly or aloof towards others. It is always a better choice to be cordial than to be uncordial, as it provides a pleasant atmosphere and encourages positive interactions.