50  agnoeo  ag-no-eh'-o

 from 1 (as a negative 
particle) and 3539; not to 
know (through lack of 
information or intelligence); 
by implication, to ignore 
(through disinclination):--
(be) ignorant(-ly), not know, 
not understand, unknown.

 see GREEK for 1

 see GREEK for 3539