أَوَلَمْ يَرَوْا۟ أَنَّ ٱللَّهَ ٱلَّذِى خَلَقَ ٱلسَّمَٰوَٰتِ وَٱلْأَرْضَ وَلَمْ يَعْىَ بِخَلْقِهِنَّ بِقَٰدِرٍ عَلَىٰٓ أَن يُحْۦِىَ ٱلْمَوْتَىٰ
"Have they not seen that God, who created the heavens and the earth and was not wearied by creating them, is able to give life to the dead?"
وَلَمْ يَعْىَ — root ع-ي-ي: to grow weary, to be unable, to be at a loss. The lexicographers also record the root's sense of "not knowing how a task is to be done".
The same idea occurs at Qāf 50/38 with another word (wa mā massanā min lughūb) and was treated in Qāf. At al-Baqara 2/255 it came from the same place: wa lā yaʾūduhū ḥifẓuhumā — the keeping of the two does not weigh upon Him.
Three verses, three different words, the same work: lughūb, ʿayy, awd. All three are words that convey a bodily limit, and all three are denied.
The logic of the argument is consistent with the rest of the sūra: having done the greater is counted as evidence of being able to do the lesser. And once again the evidence comes out of observation — a-wa-lam yaraw (have they not seen).