untoward

un|to|ward /'ʌntəw'ɔːrd, AM -t'ɔːrd/
[ADJ] pron-indef ADJ, ADJ n
If you say that something untoward happens, you mean that something happens that is unexpected and causes difficulties. (FORMAL)
The surveyor's report didn't highlight anything untoward...
Tampering with a single enzyme can lead to untoward effects elsewhere.

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