Wordnet 3.0
ADJECTIVE (1)
1. 
 not artificially colored or bleached; 
- Example: "unbleached blonde hair"- Example: "her hair is uncolored"- Example: "undyed cotton"[syn: unbleached, uncolored, undyed]
WordNet (r) 3.0 (2006):
undyed
    adj 1: not artificially colored or bleached; "unbleached blonde
           hair"; "her hair is uncolored"; "undyed cotton" [syn:
           unbleached, uncolored, undyed]