tenuous
adjective /ˈtenjuəs/
  /ˈtenjuəs/
- so weak or uncertain that it hardly exists- a tenuous hold on life
- His links with the organization turned out to be, at best, tenuous.
 
- extremely thin and easily broken- the tenuous threads of a spider’s web
 
Word Originlate 16th cent.: formed irregularly from Latin tenuis ‘thin’ + -ous.