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in the PONS Dictionary

invalidate [ɪnˈvælɪdeɪt] VB trans

1. invalidate:

invalidate argument, decision
дока́зывать несостоя́тельность
invalidate results
счита́ть неубеди́тельным

2. invalidate LAW:

invalidate
признава́ть недействи́тельным [или незако́нным]
to invalidate a judgement
аннули́ровать пригово́р
Present
Iinvalidate
youinvalidate
he/she/itinvalidates
weinvalidate
youinvalidate
theyinvalidate
Past
Iinvalidated
youinvalidated
he/she/itinvalidated
weinvalidated
youinvalidated
theyinvalidated
Present Perfect
Ihaveinvalidated
youhaveinvalidated
he/she/ithasinvalidated
wehaveinvalidated
youhaveinvalidated
theyhaveinvalidated
Past Perfect
Ihadinvalidated
youhadinvalidated
he/she/ithadinvalidated
wehadinvalidated
youhadinvalidated
theyhadinvalidated
See further verb tables