On Breaking Parallel Structure

I have written often in this blog about the value of parallel structure in creating fluent, clear, and concise phrasing. Just type the term parallel in the search bar on this page for numerous helpful tips and examples on the topic. 

I have also written about breaking parallel structure to achieve a desired effect in fiction and business writing, and I have shown how great writers like Joan Didion have done so. For another example of breaking parallel structure, simply in the name of plain language, here is a sentence from former US President Barack Obama in a tribute on X to Ethel Kennedy after her death:

Ethel Kennedy was a dear friend with a passion for justice, an irrepressible spirit, and a great sense of humor.

If you'd say that sentence seems understandable, I'd agree. But Obama breaks with the parallel convention, which would not have proven as good a sentence. He describes three Kennedy's attributes:

• passion for justice (noun + prepositional phrase)
• irrepressible spirit (adjective + noun)
• great sense of humor (adjective, noun + prepositional phrase)

 Note the inconsistency in the phrasing. Here are three alternative and consistent phrasings based on the context of the original sentence:

1. Noun + Prepositional Phrases: Ethel Kennedy was a dear friend with a passion for justice, humanity through an irrepressible spirit, and a sense of humor. 
2. Adjectives + Nouns: Ethel Kennedy was a dear friend with passionate justice, an irrepressible spirit, and great humor.  
3. Adjectives, Nouns + Prepositional Phrases: Ethel Kennedy was a dear friend with a deep sense of justice, an irrepressible spirit for humanity, and a great sense of humor. 

I hope you agree with me that example 1 seems robotic and redundant, example 2 nonfluent and confusing, and example 3 overwritten and verbose. Obama's usage, on the other hand, seems ironically parallel, although it technically isn't. The three phrases he chooses are more common speech and, therefore, heartfelt and understandable.

My point: Use parallel structure but know when to break this rule.