nonsensical (adj.)

• absurd
• asinine
• askew
• bizarre
• cockamamie
• crazy
• dumb
• extravagant
• fantastic
• foolish
• grotesque
• high-flown
• idiotic
• imbecilic
• incredible
• irrational
• laughable
• loony
• ludicrous
• mad
• meaningless
• monstrous
• moronic
• nutty
• outrageous
• outre
• preposterous
• ridiculous
• rubbishy
• screwball
• screwy
• senseless
• silly
• stupid
• trashy
• warped
• weird
• wild