What word describes someone who shows a strong dislike for all humanity?

The term that describes someone who has a strong dislike for all humanity is "misanthrope." This word originates from the Greek "misanthropos," where "miso-" means hatred and "anthropos" refers to man or humanity. A misanthrope typically harbors cynicism about human nature and often withdraws from social interactions, expressing disdain towards the behaviors and motivations of other people.

The other options represent contrasting attitudes or philosophies. A humanitarian is someone who seeks to promote human welfare and social reform, actively helping and caring for others. A philanthropist, similarly, is someone who loves humanity, often through charitable donations and efforts aimed at improving the lives of others. An idealist generally holds a belief in or pursuit of noble ideals, potentially envisioning a better society or world based on optimism rather than discontent. Each of these alternatives reflects a positive or constructive engagement with humanity, which distinctly opposes the views of a misanthrope.