1. What does it mean?
할많하않 compresses 할 말은 많지만 하지 않겠다. It signals withheld criticism, resignation, or the decision not to continue an argument despite having strong thoughts.
Also written or said as 할말하않, halmanhaan
2. The nuance
It is not neutral silence: readers often hear the implied complaint. Using it at work or after someone's apology can sound passive-aggressive rather than peacefully closing the subject.
3. Examples
“예약이 세 번이나 바뀐 일은 할많하않이다.”
I have a lot to say about the reservation changing three times, but I'll leave it there.
“그 결말에 대해서는 할많하않. 다른 얘기하자.”
I've got plenty to say about that ending, but let's talk about something else.
Sources
References support the meaning and usage. Example sentences are written for NoCapWiki.