ser/estar ajeno a algo: ser inconsciente de/indiferente a algo que no le corresponde, interesa o afecta; no estar involucrado en/relacionado con algo.
-Ella es ajena al plan — She is oblivious to the plan [≈Inconsciente de y/o no interesada en]
-Era ajeno al peligro — He was unaware of /oblivious to the danger [≈Inconsicente de o no afectado por]
-Estaba ajeno a lo que pasaba a su alrededor — He was unaware of/oblivious to what was going on around him [≈Inconsciente de, no interesado o afectado]
-Es de alguien ajena a esta empresa — It belongs to someone unrelated to/outside this company [≈No relacionado con o involucrado en]
-El fallo es ajeno al banco — The error is unconnected to the bank [≈No relacionado con o involucrado en]