WordReference English-Spanish Dictionary © 2015:

Principal Translations
desconocer vtrverbo transitivo: Verbo que requiere de un objeto directo ("di la verdad", "encontré una moneda"). (no saber algo)not know adv + vtr
  (disapproving: be uninformed about)be ignorant of v exprverbal expression: Phrase with special meaning functioning as verb--for example, "put their heads together," "come to an end."
  (not be aware of)be in the dark about, be unaware of, be unconscious of v exprverbal expression: Phrase with special meaning functioning as verb--for example, "put their heads together," "come to an end."
  be unknown v aux + adj
 Desconocen los motivos por los que decidió cerrar el local.
 They do not know why he decided to shut down the pub.
 * The girl disappeared two weeks ago, and her whereabouts are still unknown.
desconocer vtrverbo transitivo: Verbo que requiere de un objeto directo ("di la verdad", "encontré una moneda"). (no reconocer) (UK: fail to identify)not recognise adv + vtr
  (US)not recognize adv + vtr
  (fail to accept or admit)not acknowledge adv + vtr
 Desconozco al pueblo en el que crecí porque ha cambiado mucho.
 I don't recognise the village of my birth when I see what it has become.
 
Additional Translations
desconocerse v prnlverbo pronominal: Verbo que se conjuga con un pronombre átono ("me", "te", "se") que concuerda con el sujeto ("lavarse", "irse", "enojarse"). (percatarse de cambios)not recognize vtrtransitive verb: Verb taking a direct object--for example, "Say something." "She found the cat."
 Te desconozco, eres un hombre nuevo.
  Is something important missing? Report an error or suggest an improvement.

'desconocer' found in these entries
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