Inconspicuous

1.  adj.
Definition: Not clearly visible or attracting attention; not conspicuous
Example: an inconspicuous garden
Sentence: The inconspicuous spy snuck up behind the criminal, knocked him out, and brought him to the station for questioning.
Notes:  This word is pronounced in-cuhn-spih-cu-us.  It is a fabulous word, and I recommend it for every use!