Dismissible is defined by Vocabulary.com as:
capable of being removed or taken away or dismissed
Dismiss is (from Merriam Webster):
to permit or cause to leave
In my context, I am trying to express that a character thinks a notion he’s had is worthy of being dismissed. He thinks the idea is absurd. Aside from just sucking it up and spelling out ‘worthy of dismissal’, which I just don’t really like the sound of, I thought I might say, ‘justifiably dismissible’. However, that ‘capable of being’ part of the definition has me unsure if I can use the word this way. Might it come across that I’m trying to say it should be capable of being dismissed or in some other way that isn’t what I’m looking for?
And here’s how I used the phrase:
He believed the notion was justifiably dismissible to begin with.