[tlhIngan Hol] Does {mon} have positive or negative meaning ? Or both ?

[mayqel qunenoS]

{mon} (v) = smile, grin, sneer, snarl, smirk

Looking up these words, I get:

grin: smile broadly, especially in an unrestrained manner and with the
mouth open
sneer: smile in a contemptuous or mocking manner
snarl: (of an animal such as a dog) make an aggressive growl with bared teeth
smirk: smile in an irritatingly smug, conceited, or silly way
smile: form one's features into a pleased, kind, or amused expression,
typically with the corners of the mouth turned up and the front teeth
exposed

Some of the above definitions are positive, and some are negative.

So, is the {mon} positive or negative ?

qunnoq