Arabic vocabulary
وَحْدَهُ is how you say “alone” in Arabic. Hear it pronounced and see it used in real example sentences from classical texts below.
وَحْدَهُ is not a separate root-word but the maṣdar وَحْدٌ ('being alone') fixed with a suffix pronoun and used adverbially, always in the accusative when not preceded by a preposition — grammarians debated whether this accusative is an adverb of place, an infinitive noun, or a denotative of state (ḥāl), but in all analyses the phrase functions to mean 'alone.' The pronoun changes with the person referred to (وَحْدَهَا 'she alone', وَحْدَهُمْ 'they alone', etc.), and the same pattern appears in the classical declaration لَا إِلٰهَ إِلَّا ٱللّٰهُ وَحْدَهُ 'there is no god but God, alone.'
Definitions synthesised from Lane's Arabic-English Lexicon (E. W. Lane, 1863–1893).
وَيصير هُوَ وَحدهُ هَمَّهُ دُونَ مَا سِوَاهُ
And He alone becomes his concern, to the exclusion of all else.
وَحْدَهُ — alone. An emphasizing accusative 'by Himself alone', with '-hu' (Him) attached — 'He, He alone'. The accusative is a fixed adverbial: exclusively He.
From: Reflecting on God's Names →فَقَالَ مُحَمَّدُ بْنُ سُلَيْمَانَ قُولِي لَهُ يَدْخُلْ وَحْدَهُ
So Muhammad ibn Sulayman said, "Tell him to enter alone."
وَحْدَهُ — alone. A state-describing word, 'by himself', carrying an attached 'him' suffix that ties the aloneness to the one entering. The suffix anchors the description to its referent.
From: Wealth and Knowledge on Trial →فَلَا تَكُونُ إِلَّا لِلَّهِ وَحْدَهُ
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Get the appSo it is only for God alone.
وَحْدَهُ — alone. This joins the linking wa- to an emphasizing noun, 'alone', carrying a tail -hu that points back to God. The suffix anchors the emphasis to Him specifically, reinforcing exclusivity, so the phrase seals the claim that worship is for God by Himself.