
bloß
just / only
Used as an adverb in the sense of 'nur' (only) or 'lediglich' (merely) to limit a statement.
Ich wollte bloß fragen, ob du kurz Zeit hast.
I just wanted to ask whether you have a moment.
just / bare
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just / only
Used as an adverb in the sense of 'nur' (only) or 'lediglich' (merely) to limit a statement.
Ich wollte bloß fragen, ob du kurz Zeit hast.
I just wanted to ask whether you have a moment.

on earth
Used as a particle in questions or exclamations to express impatience, a warning, or surprise.
Wo ist er bloß geblieben?
Where on earth has he gone?

bare
As an adjective in the sense of 'naked', 'uncovered', or 'without protection'.
Er lief mit bloßen Füßen über die Wiese.
He walked across the meadow in bare feet.

mere
As an adjective in the sense of 'pure', 'mere', or 'alone', reducing something to its core.
Die bloße Anwesenheit des Chefs machte alle nervös.
The mere presence of the boss made everyone nervous.
The word 'bloß' is related to the verb 'entblößen' (to uncover something, to make naked). The basic idea of 'bloß' is therefore always something that is 'uncovered', 'reduced', or 'pure'.
Er stand mit bloßen Füßen im Gras.
He stood in the grass in bare feet.
In questions or requests, 'bloß' often expresses an emotion such as impatience, worry, or a warning. The meaning here is not literal, but colored by emotion.
Was hat er bloß vor?
What on earth is he planning?
In the meaning of 'uncovered', 'bloß' is often used in fixed phrases. Common examples are 'mit bloßen Händen' (with bare hands), 'mit bloßem Auge' (with the naked eye), or 'mit bloßen Füßen' (in bare feet).
Der Stern ist mit bloßem Auge kaum zu erkennen.
The star is barely visible to the naked eye.
As an adjective, 'bloß' can also reduce an abstract idea to its core. Common combinations are 'die bloße Tatsache' (the mere fact), 'der bloße Gedanke' (the mere thought), or 'der bloße Anblick' (the mere sight).
Der bloße Gedanke an die Prüfung machte sie nervös.
The mere thought of the exam made her nervous.
because
Denn and bloß can accompany surprised or concerned questions. Denn connects the question more closely to the current conversational situation, while bloß usually signals stronger bewilderment, urgency, or surprise. Use denn for a normal follow-up question and bloß when the emotional reaction is more pronounced.

Du bist so still, was ist bloß los?
You're being so quiet; what on earth is wrong?
Du bist so still, was ist denn los?
You're being so quiet; what's going on?