1. tenuous -- (having thin consistency; "a tenuous fluid")
2. tenuous -- (very thin in gauge or diameter; "a tenuous thread")
3. flimsy, fragile, slight, tenuous, thin -- (lacking substance or significance; "slight evidence"; "a tenuous argument"; "a thin plot"; a fragile claim to fame")
1.
It was extremely tenuous and only noticeable against the opening which led to daylight. - from A Princess of Mars by Edgar Rice Burroughs