adjective
interesting, fascinating
B1
interessant: adjective meaning 'interesting' or 'fascinating', used to describe people, things, ideas. Gradable: comparative interessanter, superlative am interessantesten. Common antonym: langweilig. Regular declension as attributive adjective requires correct endings (der interessante Film) and works predicatively (Das ist interessant). Not a participle.
Examples
Die Ausstellung war so interessant, dass ich mehrere Stunden geblieben bin.
The exhibition was so fascinating that I stayed for hours.
Obwohl der Vortrag interessant war, blieben wenige Besucher, weil der Raum zu klein war.
Although the lecture was interesting, few visitors stayed because the room was too small.
Das Buch ist sehr interessant.
The book is very interesting.
Details
Mnemonics
a person leaning forward in a chair because something grabbed their attention
like 'interest-ant' — imagine an ant reading a book to remember 'interessant'
Notes
A very common adjective; comparative and superlative are regularly formed (interessanter, am interessantesten).