This is only the most tenuous evidence for it.

This is only the most tenuous evidence for it. Correct Answer abundant

Tenuous : very weak or slight.
Abundant : existing or available in large quantities; plentiful.
Enough : as much or as many as required.
Reasonable : having sound judgement; fair and sensible.
Less : a smaller amount of; not as much.

Antonym of Tenuous is Abundant

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