أبَد: دَوَام، خُلُود eternity, perpetuity

إلى الأبَد، أَبَدَ الدّهْر forever, perpetually, eternally; for good, permanently

إلى أَبَدِ الآبِدِين forever and ever

أبَدًا: قَطّ، مُطْلَقًا never, not at all, absolutely not, by no means, by no chance, in no case, under no conditions, on no account

أبَدًا: دائِمًا always, forever, ever