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.

adjective

healthy , significant , stable , strong , substantial , thick

adjective

aerial , airy , attenuate , attenuated , delicate , doubtful , dubious , ethereal , fine , flimsy , gossamer , insignificant , insubstantial , light , narrow , nebulous , questionable , rare , rarefied , reedy , shaky , sketchy , slender , slight , slim , subtle , twiggy , feeble , unsubstantial , dilute , fragile , thin , weak