extremely thin (figuratively); "hanging by a thread"; very weak and insubstantial
The evidence linking the suspect to the murder was extremely tenuous.
tenuare (to make thin) (Latin)
Tenuous comes from Attenuate. Attenuate means to make thin. this word sound very close to TENNIS. and most of the female TENNIS PLAYERS ARE VERY SLIM AND THIN. split it "Ten+of+us". It is a rare possiblity that ten of us will accomodate in car TENUOUS can be split as TEN+US, so TEN of us goin to USa together, the chances are very SLIM and it'll be a RARITY