How is the word "dubiously" best described?

The word "dubiously" is best described by the notion of being uncertain, questionable, or suspicious about something. It conveys a sense of doubt or skepticism, often implying that the truth or validity of a statement, situation, or action is suspect. When someone approaches a scenario dubiously, it highlights their hesitation or lack of trust regarding its authenticity or reliability.

In contrast, the other descriptors focus on alternate tones: being lively suggests energy and enthusiasm; a straightforward manner connotes clarity and honesty; and an optimistic manner implies a positive, hopeful outlook. "Dubiously" distinctly separates itself from these meanings by embodying ambiguity and skepticism. Thus, the best representation of "dubiously" aligns with the idea that it conveys a questionable and dubious manner.