Undeterred is most naturally followed by by when naming the difficulty or obstacle that failed to stop someone.
Use undeterred by for obstacles, criticism, risks, or setbacks that do not stop someone. From can appear before an action phrase, but it belongs to the verb that follows rather than to undeterred itself. In, about, and after are not standard fixed combinations with undeterred.
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
Use by with problems, criticism, danger, or failure.
By can introduce people whose actions or opinions failed to stop someone.
From usually belongs with the following verb phrase, as in deter someone from doing something.
The same subject can take different constructions because each sentence answers a different question.
Some combinations appear in real text but do not mean what learners often assume.
About is not idiomatic after undeterred.
✕ She was undeterred about the criticism. ✓ She was undeterred by the criticism.By introduces the obstacle. From usually comes before an action.
✕ They were undeterred from the delays. ✓ They were undeterred by the delays.After only adds time information.
✓ He remained undeterred after the accident.In can describe an area of activity, not the discouraging factor.
✕ She was undeterred in the criticism. ✓ She was undeterred by the criticism.Choose the expression that matches the intended meaning.
Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.
Yes. It is the normal way to mention an obstacle or discouraging factor.
Yes, especially before an action phrase such as from continuing or from applying again.
It is generally not considered idiomatic in modern English.
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