Which pair of words is an example of antonyms?

The pair of words "Happy/Sad" represents antonyms because they convey opposite emotions. "Happy" indicates a state of joy or contentment, while "Sad" reflects a state of sorrow or unhappiness. This direct contrast in meaning between the two words clearly identifies them as antonyms.

In the other pairs, the words either do not convey opposing meanings or are closely related in context. For instance, "Eager" and "Enthusiastic" both express a positive outlook and a desire for engagement, rather than representing opposites. "Describe" and "Portray" are synonyms that express similar ideas about depicting or representing something, lacking any contrast in meaning. Lastly, "Above" and "Below" are also antonyms, but the focus here is specifically on the emotional context provided by "Happy/Sad."