
unschlüssig
undecided
Not able to make a decision; hesitant and indecisive.
Sie stand unschlüssig vor dem Regal und wusste nicht, welches Buch sie kaufen sollte.
She stood undecided in front of the shelf and did not know which book she should buy.
undecided / inconclusive
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undecided
Not able to make a decision; hesitant and indecisive.
Sie stand unschlüssig vor dem Regal und wusste nicht, welches Buch sie kaufen sollte.
She stood undecided in front of the shelf and did not know which book she should buy.

inconclusive
In logic or argumentation, not compelling or convincing; not logically consistent. This meaning is rare and technical.
Seine Argumentation war in mehreren Punkten unschlüssig und voller Widersprüche.
His argumentation was inconclusive on several points and full of contradictions.
'Unschlüssig' consists of the negation 'un-' and 'schlüssig' (conclusive / coherent). 'Schlüssig' derives from 'der Schluss' (conclusion). Therefore, 'unschlüssig' can mean that a person has not yet come to a conclusion (a decision), or that an argumentation does not allow for a logical conclusion.
Ich bin noch unschlüssig, welches Auto ich kaufen soll.
I am still undecided about which car I should buy.
The meaning depends on the subject. If 'unschlüssig' refers to a person, it means 'unentschlossen' (undecided). If it refers to something like an argumentation, a plan, or a theory, it means 'nicht logisch' (not logical) or 'widersprüchlich' (contradictory).
Der Kunde war unschlüssig, ob er das rote oder das blaue Hemd nehmen sollte.
The customer was undecided about whether he should take the red or the blue shirt.
When a person is undecided, a subordinate clause often follows that expresses the open question. Typical patterns are 'unschlüssig sein, ob ...' (to be undecided whether ...), '..., was ...' (... what ...), or '..., wie ...' (... how ...).
Er war unschlüssig, ob er das Jobangebot annehmen sollte.
He was undecided about whether he should accept the job offer.
To describe the state of indecision, 'unschlüssig' is often combined with verbs such as 'sein' (to be), 'wirken' (to seem), 'bleiben' (to remain), or 'dastehen' (to stand there).
Sie wirkte unschlüssig und bat um mehr Bedenkzeit.
She seemed undecided and asked for more time to think.
The meaning 'nicht folgerichtig' (not logically consistent) or 'nicht logisch' (not logical) is rare. It is used almost exclusively in formal, academic, or technical contexts to evaluate arguments or lines of reasoning.
Das Gutachten wurde als unschlüssig kritisiert, da wichtige Daten fehlten.
The expert report was criticized as inconclusive because important data was missing.
tied / undecided
Unentschieden can express that a person's choice is still open. Unschlüssig emphasizes more strongly that the person is hesitating internally and cannot reach a decision. Unentschieden is suitable for an open position, while unschlüssig is more appropriate when the person is clearly having difficulty deciding.

Paul ist unschlüssig, weil beide Kurse gleich viele Vorteile haben.
Paul is undecided because both courses offer the same number of advantages.
Paul ist noch unentschieden, welchen der beiden Kurse er wählen wird.
Paul still hasn't decided which of the two courses he will choose.