The antonyms for the word "welldisposed" include unfriendly, hostile, unkind, malicious, malevolent, spiteful, and acrimonious. People who are unfriendly tend to be cold and distant, showing little interest in building relationships or being hospitable. Hostile individuals show aggressive behavior and are often openly antagonistic towards others. Unkind and malicious people deliberately harm others without any rational basis, while those who are malevolent harbor malicious intent towards others. Spleenful individuals are argumentative and discontented, characterized by bitterness and resentment. A person who is acrimonious tends to be sarcastic and contentious, often with a negative and combative attitude.