What term refers to unreasonable feelings or attitudes directed toward members of other groups?

The term that best describes unreasonable feelings or attitudes directed toward members of other groups is "prejudice." Prejudice encompasses preconceived notions or judgments about individuals based solely on their membership in a particular group, which can include aspects such as race, ethnicity, religion, or sexual orientation. This can manifest as either a positive or negative sentiment, but it is often highlighted by its negative connotation and the irrationality behind it.

Cultural bias refers specifically to interpreting and judging phenomena based on the standards and customs of one's own culture, which may influence perceptions but does not solely convey the emotional aspect indicated in the question. Discrimination involves actions taken based on prejudiced beliefs, usually to the detriment of those being targeted, and while it’s related to prejudice, it focuses more on the behavior rather than the underlying feelings or attitudes. Intolerance refers to an unwillingness to accept views, beliefs, or behavior that differ from one's own, which can stem from prejudice but does not encapsulate the irrational emotions tied to it.

Thus, "prejudice" is the most appropriate term for describing unreasonable feelings or attitudes directed toward members of other groups, emphasizing the irrational nature of these sentiments.