nonsensical
adj.having no meaning or sense. You use this to describe something that is so strange or illogical that it is hard to understand.
adj.lacking a logical or meaningful structure; absurd or meaningless. Often used to describe arguments, statements, or behaviors that defy reason.
“The instructions were so nonsensical that I couldn't follow them.”
“The politician's latest speech was filled with nonsensical claims that made no sense to the audience.”
“The critic argued that the film's plot was a series of nonsensical events that failed to connect with any coherent theme or narrative arc.”
“He’s hosting a TV baking gameshow that uses no ovens, so it’s completely nonsensical.”
“It’s not like I care for the nonsensical storyline, or the dubstep editing, or the ham acting.”
From nonsense + -ical.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.