ungestraft
unpunished
Without being punished for an act, a crime, or misconduct.
Es kann nicht sein, dass solche Vergehen ungestraft bleiben.
It cannot be the case that such offenses go unpunished.

unpunished
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unpunished
Without being punished for an act, a crime, or misconduct.
Es kann nicht sein, dass solche Vergehen ungestraft bleiben.
It cannot be the case that such offenses go unpunished.

The word is made up of the prefix 'un-' (not) and 'gestraft' (past participle of 'strafen', to punish). It therefore literally means 'not punished'.
Der Dieb konnte mit dem Geld ungestraft entkommen.
The thief was able to escape with the money unpunished.
'Ungestraft' (unpunished) is mostly used as an adverb. It then describes a verb and answers the question 'How?'. It often appears with verbs such as 'bleiben' (to remain) or 'davonkommen' (to get away with it).
Solch ein Verhalten darf nicht ungestraft bleiben.
Such behavior must not go unpunished.
A very common and fixed expression is 'ungestraft davonkommen' (to get away unpunished). It means not having to face any consequences for a bad act or a crime.
Der Betrüger ist leider ungestraft davongekommen.
Unfortunately, the fraudster got away unpunished.
not punishable / without convictions
'ungestraft' and 'straffrei' both have to do with punishment. 'ungestraft' says that someone is not punished for something, even though the action may be wrong or forbidden. 'straffrei' sounds more strongly connected to law and legislation: an action is not punishable by law, or a person has no prior convictions. Learners may confuse the words because both can mean 'without punishment'. In practice: for a specific act, 'ungestraft' often fits; for a legal assessment or prior convictions, 'straffrei' is more likely.

Der Dieb konnte nicht ungestraft davonkommen.
The thief could not get away unpunished.
Nach dem Gesetz bleibt diese Handlung in bestimmten Fällen straffrei.
Under the law, this action is not punishable in certain cases.