Wordnet 3.0
NOUN (1)
1. 
 a person belonging to no caste; 
ADJECTIVE (1)
1. 
 not belonging to or having been expelled from a caste and thus having no place or status in society; 
- Example: "the foreigner was a casteless person"[syn: outcaste, casteless]
WordNet (r) 3.0 (2006):
outcaste
    adj 1: not belonging to or having been expelled from a caste and
           thus having no place or status in society; "the foreigner
           was a casteless person" [syn: outcaste, casteless]
    n 1: a person belonging to no caste