unsteady 

Definition:  (adjective) Not firm, solid, or securely in place; unstable.  
Synonyms:  unfirm  
Usage:  He climbed carefully up the unsteady ladder and cleaned the leaves that had clogged the gutter around the house.  

  

clog：to block sth or to become blocked

gutter: a long curved channel made of metal or plastic that is fixed under the edge of a roof to carry away the water when it rains