Idle speculation only, and not in fact written in a mood of depression at all...

What use is a grin?
For what purpose is it intended?

It is not a poetic word

So let us seek a poetic word

Many would prefer “smile”
Perhaps
And that is not the same

And that is all there is to prefer

Unless one cares for “smirk”
An altogether unpleasant word
For my taste

It is odd

Should one wish to weep, then
One may also
Cry,
Bawl
Bemoan
Wail
Keen
Grieve
Lament
Sigh or sob

And the poet may use any one of these

But should one wish to grin
Then that is the end of it
No other word there is
For this most human of aspects

And no poet ever used it

Why should the human condition require
That unhappiness should have
An entire lexicon at its disposal?

And yet
Broad joy
And happiness
And love of life…….
And its expression

Should have only one word?