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in the PONS Dictionary

impugnar [impuɣˈnar] VB trans

1. impugnar t. LAW:

impugnar
anfechten

2. impugnar:

impugnar (combatir)
bestreiten
impugnar (una teoría)
angreifen
impugnar (una teoría)
zu widerlegen suchen
presente
yoimpugno
túimpugnas
él/ella/ustedimpugna
nosotros/nosotrasimpugnamos
vosotros/vosotrasimpugnáis
ellos/ellas/ustedesimpugnan
imperfecto
yoimpugnaba
túimpugnabas
él/ella/ustedimpugnaba
nosotros/nosotrasimpugnábamos
vosotros/vosotrasimpugnabais
ellos/ellas/ustedesimpugnaban
indefinido
yoimpugné
túimpugnaste
él/ella/ustedimpugnó
nosotros/nosotrasimpugnamos
vosotros/vosotrasimpugnasteis
ellos/ellas/ustedesimpugnaron
futuro
yoimpugnaré
túimpugnarás
él/ella/ustedimpugnará
nosotros/nosotrasimpugnaremos
vosotros/vosotrasimpugnaréis
ellos/ellas/ustedesimpugnarán
See further verb tables