The fact is, Mr. niggle, we dont wish to wound your feelings.
Mr. niggle, the gentleman with whom you saw me yesterday, is my friend.
niggle, eat in peace and thankfulness; for I have once more saved you from the abyss of matrimony.
1590s (implied in niggling), possibly from a Scandinavian source (cf. Norwegian dialectal nigla "be busy with trifles"), perhaps related to source of niggard. Related: Niggled; niggling; niggler.