In "The Invisible Man" by H. G. Wells, the character displays a persistent sense of irritation that deeply affects his demeanor. This chronic annoyance suggests he is troubled by something significant, though the specifics remain unclear. His resulting behavior includes a tendency to engage in low-voiced conversations with himself, indicating a possible descent into isolation or madness.

Mrs. Hall, observing him closely, tries to understand his ramblings but finds herself perplexed by the incoherence of his mutterings. This scenario highlights the invisible man's internal struggles and the challenges those around him face in reaching out or comprehending his state of mind.