Which word would best describe a strategy that seems ineffective and hopeless?

The word "untenable" best describes a strategy that seems ineffective and hopeless because it specifically refers to something that cannot be maintained or defended against objection. When a strategy is labeled as untenable, it suggests that it lacks support or justification, rendering it ineffective in achieving desired outcomes. This aligns perfectly with the notion of hopelessness, as an untenable strategy is one that cannot realistically succeed or be continued with any expectation of success.

In contrast, "timorous" conveys a sense of fearfulness, which does not directly address the ineffectiveness of a strategy. "Stupefying" means shockingly impressive or bewildering, which is not relevant to describing lack of efficacy. "Torpid" refers to a state of inactivity or sluggishness, which also does not capture the essence of a strategy that is ineffective or hopeless. Thus, untenable distinctly captures the idea of a strategy that is not only ineffective but also beyond the point of being sustainable or justifiable.