Tenuous (adjective)

1. Having little substance or strength; flimsy.
2. Having little connection or relationship; not strong or certain.

Origin:

Derived from the latin word "tenuis" meaning "thin or slender".

Examples:

1. The argument was based on tenuous evidence.
2. The link between the two events was tenuous at best.
3. The connection between the suspects is tenuous.
4. The company's financial situation was tenuous.
5. The relationship between the couple was tenuous.