Saying how sure you are: wellicht, vermoedelijk, blijkbaar and ongetwijfeld

Certainty adverbs show how a speaker evaluates a claim. De trein is waarschijnlijk vertraagd. (The train is probably delayed.) gives a probability judgment, while De trein is blijkbaar vertraagd. (The train is apparently delayed.) presents a conclusion based on signs or other evidence.

First choose whether you are expressing certainty, probability, possibility, visible evidence, or a report from others. Then choose a word whose register fits the text.

1. Decide what supports the claim: your probability judgment, observable signs, or somebody else's report.
2. Choose a word from the matching group. Waarschijnlijk estimates probability; blijkbaar points to evidence; naar verluidt attributes a report.
3. Check whether the word states your own judgment, draws an inference, or attributes the claim to another source.

This is not one mathematical ladder. Blijkbaar does not simply mean a weaker or stronger waarschijnlijk: it signals an inference from what appears to be the case. Naar verluidt identifies reported information rather than your own probability estimate. Uiteraard adds the idea that the claim should be self-evident.

Register also matters. Misschien is the plain everyday possibility word. Wellicht can carry the same basic possibility meaning but may sound formal or old-fashioned in modern public-facing prose. Choose it when that tone fits; it does not automatically make a sentence better.

Position can change which part of a sentence an adverb applies to. The complete middle-field placement lesson belongs to focus particles and their scope; this page keeps its examples in ordinary positions and teaches the meanings.

No. In current usage, schijnbaar can overlap with blijkbaar in the meaning ‘apparently’. Careful writing often keeps a clarity distinction: use blijkbaar for a conclusion supported by signs, and schijnbaar for something that only appears true but may not be. This is a writing recommendation, not a claim that the overlapping use is absent or automatically incorrect.

Certainty adverbs evaluate truth, evidence, or source. Unstressed modal particles such as interactional even, maar, and toch colour the speaker's tone instead; they are a different lesson.

• Use ongetwijfeld when you present a conclusion with high confidence.
• Use waarschijnlijk or vermoedelijk for a probability judgment.
• Use misschien, mogelijk, or wellicht when you leave more than one outcome open.
• Use blijkbaar or kennelijk when signs support an inference.
• Use naar verluidt when you explicitly pass on what other people or reports say.

• Do not treat every item as one point on a certainty scale. Evidence and reported source are separate dimensions.
• Do not use blijkbaar as a mere synonym for waarschijnlijk when no evidence-based inference is intended.
• Do not teach blijkbaar and schijnbaar as rigid opposites. Their current uses overlap, although the clarity distinction remains useful.
• Do not choose a formal-looking adverb only to make a claim sound more certain. Register and degree of certainty are separate choices.

Use focus particles and their scope for the placement system. Compare modal particles, the position of niet, neutral Time–Manner–Place order, and fronting.