When something happens anomalously, it does not follow the usual pattern — it shows up in a way you did not expect. This is the adverb from anomalous: you use it to say how something behaved, not to name the odd thing itself. It is a formal, mostly written word. Scientists, doctors, and people writing reports like it: a reading can come out anomalously high, or a result can sit anomalously far from the rest. In ordinary talk, people more often say oddly, strangely, or in a weird way. You will meet it in news about science, weather, or numbers that do not fit. Though actually, it does not always mean “wrong” or “bad”; it only means “not what the pattern led you to look for.” A warm day in a cold month can be anomalously warm without being a disaster.