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Lit., "without [any] truth" or "justification" (bi-ghayr al-haqq).
Lit., "and they thought that they would not be brought back to Us". There is no doubt that the ancient Egyptians did believe in a life after death, and that this belief included the concept of a divine judgment as well. Since, however, the particular Pharaoh whom Moses confronted is said to have behaved with an arrogance opposed to all good sense, the Qur'an - by implication - likens his attitude to that of a person who does not believe in resurrection and in man's ultimate responsibility before God: hence my rendering of the conjunctive particle wa at the beginning of the above clause as "just as if".
They did not believe in the Hereafter. They did not understand that every deed must have its inevitable consequence, good, or evil, unless the Grace of Allah intervenes to save us from ourselves!