The phrase "altered unexpectedly" is correct and usable in written English.
It can be used when describing a situation where something has changed in a surprising or unforeseen manner.
Example: "The schedule was altered unexpectedly, causing confusion among the team members."
Alternatives: "changed unexpectedly" or "modified unexpectedly."
The Vonns' divorce unexpectedly altered what had been a winsome story line of a skiing star with rare, crossover mainstream popularity.
However, an increase of loaded ZnO amount unexpectedly altered the structure of nanoparticle nanolayer, caused partial closure of nanotube interior and significantly reduced ZnO solubility and antibacterial efficacy.
When Jan returns to Earth (approximately 80 years after his departure by Earth time) he finds an unexpectedly altered planet.
During normal mammary gland development the cellular distribution of the progesterone and prolactin receptors was unexpectedly altered from a nonuniform to a relatively uniform pattern in the ductal epithelium of C/EBP-β-/ mice.
Next we probed whether the use of A2 to render the TTR products of the subunit exchange reaction fluorescent could unexpectedly alter the calculated rate of subunit exchange.
The county leaders who said they were still supporting Mr. Lazio conceded that Mr. Levy's entrance into the race had unexpectedly and dramatically altered its dynamic and complicated matters for Mr. Lazio.
Now, the landscape has altered again, from an Appalachian woodland unexpectedly full of Nordic pines, to the desert at sunset.
Unexpectedly, we only detected altered activity for Stat3, 4, 5 and 6 (Figure 5).
We have removed "unexpectedly" from the Abstract and altered the tone of the discussion as suggested by the reviewers.
Unexpectedly, this combinatorial code is altered in aged animals: odor-evoked activity in secondary, but not primary, olfactory neurons is reduced.
