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Tenuous
Subjective Interpretation
The word 'tenuous' can imply subjectivity, suggesting someone's personal view on the stability or certainty of something. 
Emphasizing Uncertainty
Use 'tenuous' to emphasize doubt or to suggest that something is barely holding together and likely to collapse or fail. 
Underlying Weakness
'Tenuous' often points to an underlying weakness or fragility in an argument, relationship, or situation. 