
fraglich
questionable
Expresses that something is uncertain, doubtful, or not settled.
Es ist fraglich, ob er bei diesem Wetter pünktlich ankommen wird.
It is questionable whether he will arrive on time in this weather.
questionable / in question
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questionable
Expresses that something is uncertain, doubtful, or not settled.
Es ist fraglich, ob er bei diesem Wetter pünktlich ankommen wird.
It is questionable whether he will arrive on time in this weather.

in question
Refers to a specific thing or person that is currently being discussed; the thing concerned.
Der fragliche Mitarbeiter hat das Gebäude bereits vor einer Stunde verlassen.
The employee in question left the building an hour ago.
The word 'fraglich' (questionable/in question) is derived directly from the verb 'fragen' (to ask). It describes something that raises a question or can be called into question.
Sein plötzliches Verschwinden ist sehr fraglich.
His sudden disappearance is very questionable.
The meaning of 'fraglich' (questionable/in question) depends on its position in the sentence. If it stands before a noun, it means 'betreffend' (concerning/in question), as in 'der fragliche Tag' (the day in question). If it stands with a verb like 'sein' (to be), it means 'unsicher' (uncertain), as in 'es ist fraglich' (it is questionable).
Der fragliche Brief wurde nie abgeschickt.
The letter in question was never sent.
In the meaning 'unsicher' (uncertain), 'fraglich' (questionable) is very often used in the fixed structure 'Es ist fraglich, ob…' (It is questionable whether…) to express doubt.
Es ist fraglich, ob das neue Gesetz wirklich eine Verbesserung bringt.
It is questionable whether the new law will really bring an improvement.
In the meaning 'betreffend' (concerning/in question), 'fraglich' (in question) is used mainly in formal contexts, such as administrative language, by the police, or in reports.
Die Polizei befragt Zeugen zum fraglichen Zeitpunkt des Unfalls.
The police are questioning witnesses about the time of the accident in question.
uncertain / insecure
“Unsicher” can mean that a person is not yet certain or does not know how to decide. “Fraglich,” by contrast, describes the matter or decision itself as doubtful or unsettled. Use “unsicher” for your own state and “fraglich” when making a statement about the matter itself.

Ob die Reise stattfinden kann, ist wegen des Streiks fraglich.
Whether the trip can go ahead is questionable because of the strike.
Ich bin unsicher, ob ich die Reise buchen soll, weil mir noch Informationen fehlen.
I’m uncertain whether I should book the trip because I’m still missing some information.