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In a sentence
Jakživ som nič také nevidel.
I have never seen anything like that.
Jakživ na ten výlet nezabudnem.
I will never forget that trip.
Nikto z nás jakživ nebol v Japonsku.
None of us has ever been to Japan.
To je najlepší koláč, aký som jakživ jedol.
That is the best cake I have ever eaten.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.