Al-Waqi'ah Verse 2

then no one can deny it has come.

there will be none to deny its occurrence;

(and none denies its descending)

no one will be able to deny it has come,

There is about its happening no lie.

Then will no (soul) entertain falsehood concerning its coming.

– and then there will be no one to deny its occurrence –

Which is bound to happen undoubtedly --

Then none will be able to deny its occurrence.

—there is no denying that it will befall—

There is no denying its happening –

There is no denying its coming to pass.

(There) is not to its falling/happening a liar/deniance/falsehood.

Then none will be able to deny its occurrence.

There is no denying that it will come -

And there can be no denying of its befalling.

When the Event comes to pass --

There is no belying its coming to pass--

There is no denying that it will befall -

no soul will deny its coming.

there is no denying its coming

There is not, for its occurrence, Kadhibah.

and there can be no denying its happening,

Of its occurrence, there is no denial.

there will be no denying its coming to pass, [there is] no soul to deny [it], by repudiating it as it did in this world,

There is not, for its occurrence, Kadhibah.

means, when He commands the Day of Resurrection to begin, none can stop it from happening or prevent it from beginning,

اسْتَجِيبُواْ لِرَبِّكُمْ مِّن قَبْلِ أَن يَأْتِىَ يَوْمٌ لاَّ مَرَدَّ لَهُ مِنَ اللَّهِ

Answer the call of your Lord before there comes from Allah a Day which can not be averted. (42;47),

سَأَلَ سَأيِلٌ بِعَذَابٍ وَاقِعٍ

لِّلْكَـفِرِينَ لَيْسَ لَهُ دَافِعٌ

A questioner asked concerning a torment about to occur -- upon the disbelievers, which none can avert. (70;1-2),

وَيَوْمَ يَقُولُ كُن فَيَكُونُ قَوْلُهُ الْحَقُّ وَلَهُ الْمُلْكُ يَوْمَ يُنفَخُ فِى الصُّوَرِ عَـلِمُ الْغَيْبِ وَالشَّهَـدَةِ وَهُوَ الْحَكِيمُ الْخَبِيرُ

And on the Day He will say;"Be!" -- and it is! His Word is the Truth. His will be the dominion on the Day when the Trumpet will be blown. All-Knower of the unseen and the seen. He is the All-Wise, Well Aware. (6;73)

As for the meaning of
كَاذِبَةٌ
(Kadhibah)

Muhammad bin Ka`b said;"It will certainly occur,"

while Qatadah said,

"It shall not be discontinued, taken back or aborted."

Allah's statement,

خَافِضَةٌ رَّافِعَةٌ