Being solicitous of refers to being concerned or attentive towards someone. The antonyms of this phrase would include being aloof, indifferent, and unconcerned. If someone is not solicitous of another person, it means they lack interest or care towards them. Instead of showing concern or attentiveness, they may be dismissive, detached, or apathetic. Being uninterested or uncaring towards others can have negative consequences, such as damaging relationships and affecting the overall well-being of those involved. Therefore, it is important to strive towards being solicitous and showing compassion towards others.