French-English translations for infirmer

disproveOne problem is that a lot of experts say that these cumulative effects are unfounded, but we have nothing to prove or disprove this. Le problème, c’est que de nombreux experts affirment que ces effets cumulatifs ne sont pas fondés, mais nous n’avons rien pour prouver ou infirmer ce fait.
infirmHe was infirm of body but still keen of mind, and though it looked like he couldnt walk across the room, he crushed me in debate.The thought is that you see an episode of observation, experiment, or reasoning as confirming or infirming a hypothesis depending on whether your probability for it increases or decreases during the episode.

invalidateThe circuit court judges ruling was invalidated by a superior judge.
nullify
us
The contract has been nullified.
weaken

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