imposant
impressive
Making a grand and impressive impression, often because of size, appearance, power, or achievement.
Die Kathedrale war ein wirklich imposantes Bauwerk.
The cathedral was a truly impressive structure.

impressive
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impressive
Making a grand and impressive impression, often because of size, appearance, power, or achievement.
Die Kathedrale war ein wirklich imposantes Bauwerk.
The cathedral was a truly impressive structure.

The adjective 'imposant' (impressive) belongs to the same word family as the verb 'imponieren' (to impress). If something 'imponiert' (impresses you), then you find it 'imposant' (impressive). Note the different sentence structure: something is 'imposant' (impressive), but something 'imponiert jemandem' (impresses someone; dative).
Die riesige Brücke ist wirklich imposant.
The huge bridge is truly impressive.
'Imposant' (impressive) is often used to describe large or striking things. Typical nouns include buildings, natural phenomena, or even abstract achievements.
Vom Gipfel aus hatten wir eine imposante Aussicht auf die Berge.
From the summit, we had an impressive view of the mountains.
The word 'imposant' (impressive) belongs to an elevated style of language. It is often found in travel guides, art reviews, or written language to express admiration.
Die Ausstellung zeigte eine imposante Sammlung moderner Kunst.
The exhibition showed an impressive collection of modern art.
powerful / mighty
'mächtig' and 'imposant' can both describe something large or impressive. 'mächtig' emphasizes size, strength, or power more. For example, you can speak of 'ein mächtiger Sturm' (a mighty storm) or 'ein mächtiger Baum' (a mighty tree). 'imposant' puts more emphasis on the impression something makes on the viewer: something looks impressive or has a very striking effect. The words can be confused because large things often also appear 'imposant'. When power or size is important, 'mächtig' fits better. When the strong impression on people is important, 'imposant' sounds more natural.

Vom Platz aus sah die alte Kirche besonders imposant aus.
From the square, the old church looked especially impressive.
Am Abend zog ein mächtiger Sturm über die Stadt.
In the evening, a mighty storm swept over the city.