Philosophically speaking, usually "not" is inevitable.
That they are interesting...philosophically speaking ofcourse.
Only you would know, philosophically speaking.
The question is gramatically incorrect and meaningless. Gramatically, it should be either "Do opposites exist" or "Does an opposite exist". To make it a meaningful, it should provide for a descriptoron the subject "opposite" or "opposites," as appropriate. Philosophically, there is a 'ying and yang' for just about every consideration.
Diogenes of Sinope, also known as Diogenes the Cynic.(He may not have been the first homeless person, but he certainly made it fashionable [philosophically speaking]).
Philosophically, everything is real, nothing is real and it is all your imagination. By that token, yes, maybe, and no.
There are around 29 countries in the world where French is spoken as an official language.
It means
An antonym for altruism would be selfishness, egotism, or exploitive. A less negative antonym would be: "objectivism" as held by Ayn Rand and expounded in her book, "The Fountainhead". Philosophically speaking, the opposite of altruism is objectivism.
Consciousness is a result of physical reality, but this can not be proven philosophically. A philosophical question is whether you, and everything of which I am aware, exist only in my consciousness, not in reality.
There is a YouTube video where you can hear her speaking French.
To treat them as if they are not there (do not exist), not listening to them, not speaking to them, not looking at them.