When you say "no punishment" you meant not justiciable by humans. We have no doubt all transgressions are liable by Heavenly court.
There are different sorts of negative Mitzvot that bear no such punishment (here's the list of all Negative Mitzvos):
Negative Mitzvos that are Lav haNitak Le'Ese (Makos 15a). As a person can fix his misdeed by performing a linked positive Mitzvah there's no immediate punishment. For example, all money related misdeeds bear no punishment because the transgressor can pay back See additional examples here.
Negative Thoughts that count as transgressions are also not punishable (probably because we can't have two witnesses), for example, imaging existing of other deities. Or Mitvos of "following one's eyes and heart".
Negative feelings (equals thought?) like not to love transgressors or #50 on the list or #58 - "Not to be afraid of enemies".
Overriding by Shev veAl Ta'ase: for example, failing to help one's fellow by NOT acting is not punishable.
Various long lasting Mitzvos, like #46 - Not to dwell in Egypt.