...found the study being not boring at all. Now the reader can fill in what that means. :-))

... the study entertaining/fascinating/riveting

depending on the degree of kurzweilig :-)

diverting

dazu schlägt mein Wörterbuch folgende Synonome vor
delightful, appealing; interesting, fascinating, intriguing, absorbing, riveting, compelling; humorous, funny, witty, comical

@ Weißkittel: So, wie Du die Angelegenheit beschreibst, meine ich, daß es zutreffend wäre, den Vorgang als 'nicht langweilig/langweilend' zu bezeichnen . . .

Ergo: 'not (at all) boring' . . .

Would there be some "neutral to positive" word in English that doesn't sound over the top? In German I'd use "kurzweilig" (even though kurzweilig *can* be much more fun)... but I guess there must be something in English too?

Regarding "boring", there's this tiny difference between thinking self-critically that it's probably "not boring"... and the knowledge that you shouldn't advertise with negatives because that makes people think of those negatives. (It's like advertising for a new detergent "that doesn't stink"... and oops, there it is, a strong connotation of the detergent brand name and stinking.)

Can "agreeable" be used with study experiences? That and "interesting" are so far on my short-list...

maybe fitting:
participants found the study worthwhile, useful
or:
Participants reacted positively towards the study /
they displayed a positive attitude towards the study/survey.

(not really a literal translation for kurzweilig, but maybe close to what you are looking for)

... wie wäre dann: 'even interesting' ? . . .

Meine Wahl wäre: 'not only not boring but even interesting' . . .

Mich wundert sehr, dass gleich drei LEO-Spezialisten mit aus meiner Sicht unzureichenden Vorschlägen kommen. Gibt es dafür tatsächlich keinen adäquaten Ausdruck außer "not boring". Den Kontext hat Weißkittel nun ja wirklich gut deutlich gemacht (kurzweilig finde ich im Deutschen übrigens wunderbar hier).

Sorry,maxxpf, deinen Beitrag hatte ich noch nicht gelesen. Die brauchbarsten Vorschläge bis jetzt finde ich, aber in ein Wort passt das nicht? Bin auch die ganze Zeit am grübeln...

is a pretty nicely connotated word without having any specific meaning here.

or: valuable, inspiring

would be my suggestion.

ok - a positive expression for not boring - here goes:


mildly entertaining

surprisingly interesting


or, my personal favorite:

kinda rad

:]

Wasn't there this German line: Greif mal nem nackten Seemann in die Tasche?

IMO all these spasmodic attempts don't apply to a "study", one can slice it, dice it or puree it. It simply remains "not boring." :-)))