soon

The word 'soon' originates from the Old English 'sōna', meaning 'immediately, at once'. This term is of Germanic origin, related to Old High German 'sān' (immediately) and Old Norse 'sónar' (immediately). It is derived from the Proto-Germanic 'sēna', a word of uncertain deeper origin, though it may be connected to the Proto-Indo-European root 'sē(i)-', meaning 'to throw, let fall, sow', with a semantic shift towards the notion of a settled or appointed time. Over centuries, its meaning softened from an immediate sense ('at once') to the more relative and future-oriented sense of 'in a short time' or 'before long' that it carries today.

The word 'soon' is a simplex word of Old English origin. It does not contain separable morphemes in its modern English form.