The quote "Obscenity is the distinguishing hallmark of a sadly limited vocabulary" from Gail Honeyman's novel "Eleanor Oliphant Is Completely Fine" underscores the notion that relying on vulgar language signifies a lack of effective communication skills. It suggests that individuals who resort to obscene expressions may do so because they struggle to articulate their thoughts and feelings more eloquently, revealing deeper issues with their ability to express themselves adequately.

This perspective invites readers to consider the importance of language and the power of words. Rather than falling back on crude expressions, individuals are encouraged to expand their vocabulary and find more constructive ways to communicate. The quote reflects the broader theme of the book, which explores the complexities of human interaction and the journey toward personal growth and understanding.