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in the PONS Dictionary

I. invalid1 [ˈɪnvəlɪd] N

invalid (sick person)

II. invalid1 [ˈɪnvəlɪd] ADJ

1. invalid (disabled):

invalid
invalid chair

2. invalid (sick):

invalid
invalid diet

III. invalid1 [ˈɪnvəlɪd] VB trans

1. invalid (disable):

invalid

Phrases:

IV. invalid1 [ˈɪnvəlɪd] VB trans

invalid (fall ill)

invalid2 [ɪnˈvælɪd] ADJ

1. invalid LAW (not legally binding):

invalid
legally invalid
to become invalid

2. invalid (unsound):

invalid
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