Synonyms:
alarmingly
Meaning: in an alarming manner; "It grew alarmingly fast"
Usage examples
The united efforts of Douglas and the Administration held the body of the Northern Democrats to his fatal policy, though protests and defections became alarmingly frequent.
This party is generally known as the "First Relief." Their route to the snow-belt lay through sections of country which had become so soft and oozy that the horses often sank in mire, flank deep; and the streams were so swollen that progress was alarmingly slow.