ATDTDA (2): "greenhorn" (46.1)

[Tim Strzechowski]

[...] [The Archduke] proceeded to lead his entourage on a lively search after ladies of flagrant repute that would have taxed the abilities of even a seasoned spotter, let alone a greenhorn like Lew" (pp. 45 - 6).
 
 
green·horn  (grnhôrn) 
n. 
1. An inexperienced or immature person, especially one who is easily deceived.
2. A newcomer, especially one who is unfamiliar with the ways of a place or group.
 
[Middle English greene horn, horn of a newly slaughtered animal : grene, green; see green + horn, horn; see horn.]
 
http://www.thefreedictionary.com/greenhorn