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in the PONS Dictionary

I. in·va·lid1 [ˈɪnvəlɪd] N (requiring long-term care)

invalid
Invalide(r) f(m) a. pej
to treat sb like an invalid

II. in·va·lid1 [ˈɪnvəlɪd] ADJ

invalid
invalid(e) a. pej
invalid
invalid chair
Rollstuhl m <-(e)s, -stühle>
sb's invalid mother

III. in·va·lid1 [ˈɪnvəlɪd] VB trans

1. invalid (injure):

to invalid sb

2. invalid usu passive Brit:

in·val·id2 [ɪnˈvælɪd] ADJ inv

invalid (not legally binding)
invalid (not legally binding)
legally invalid
invalid COMPUT
invalid (unsound)
invalid theory
technically invalid
Present
Iinvalid
youinvalid
he/she/itinvalids
weinvalid
youinvalid
theyinvalid
Past
Iinvalided
youinvalided
he/she/itinvalided
weinvalided
youinvalided
theyinvalided
Present Perfect
Ihaveinvalided
youhaveinvalided
he/she/ithasinvalided
wehaveinvalided
youhaveinvalided
theyhaveinvalided
Past Perfect
Ihadinvalided
youhadinvalided
he/she/ithadinvalided
wehadinvalided
youhadinvalided
theyhadinvalided