tr.v. frustrated, frustrating, frustrates 
 1.  To prevent from accomplishing a purpose or fulfilling a desire; thwart: 
2.  To cause feelings of discouragement or bafflement in.
 3. To ineffectual or invalid; nullify.
 
 
 
EXAMPLE SENTENCES:
 
   1.  A persistent wind frustrated my attempt to rake the lawn.
   2.  many frustrated poets end as pipe-smoking teachers"; "his best efforts were thwarted"