laughable

laughable
laugh‧a‧ble /ˈlɑːfəbəl $ ˈlæ-/ adjectivesomething that is laughable is impossible to believe or be serious about, because it is so silly or bad
   SYN  ridiculous:
    The promises are so far from reality that they are laughable.
—laughably adverb
     

THESAURUS

■ very stupid
   ▪ crazy not at all sensible or reasonable – used when you are very surprised by someone’s behaviour or what they have said: Ian’s got some crazy plan to drive across Africa. | She looked at me as if I was crazy! | You’re crazy to think of hitch-hiking on your own.
   ▪ ridiculous extremely stupid: You look ridiculous in that hat. | Some people spend a ridiculous amount of money on cars. | It’s absolutely ridiculous to suggest that he would do something like that.
   ▪ absurd/ludicrous extremely stupid – used especially when an idea or situation seems strange or illogical: How can a return ticket cost less than a single? It’s totally absurd! | It was a ludicrous idea. | Some of the objections to the theory are simply absurd.
   ▪ laughable so stupid that you cannot believe someone is telling the truth or being serious: The accusations were almost laughable. | a laughable suggestion | It would be laughable if it wasn’t so serious.