What is Untenuous?

Untenuous definition and meaning on Dictionary terms:

thin or slender in form, as a thread.
lacking a sound basis, as reasoning; unsubstantiated; weak: a tenuous argument.
thin in consistency; rare or rarefied.
of slight importance or significance; unsubstantial: He holds a rather tenuous position in history.
lacking in clarity; vague: He gave a rather tenuous account of his past life.