'Singularly' in the Bible

'Speak unto the sons of Israel, and thou hast said unto them, When a man or woman doeth singularly, by vowing a vow of a Nazarite, to be separate to Jehovah;

Her (ceremonial) uncleanness was on her skirts;She did not [seriously] consider her future.Therefore she has come down [from throne to slavery] in an astonishing manner;She has no comforter.“O Lord” [cries Jerusalem], “look at my affliction,For the enemy has magnified himself [in triumph]!”