Have you checked a dictionary? com/dictionary/unknowable
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liengsu"Knowledge of the unknowable"What does it mean? Could you explain it?A paradoxical, non-existent entity. If it is knowledge, someone knows it. If someone knows it, it can't be unknowable.
Aspara GusAll my life I have ...I think you meant 'striven' (or 'strived')?
CalifJimI think you meant 'striven' (or 'strived')?Looks like you’re right. I had always thought that strove was an acceptable past participle form.
Aspara Gusacceptable past participleThe 'cheat sheet' that I keep on irregular verbs says 'drive', 'thrive' and 'strive' are all conjugated the same way, but that the latter two are among the 10 least used irregular verbs and can be treated as regular verbs as well.
CalifJim(Can you imagine 'has arriven'?)