The definition of nonsensical is something silly or that doesn't make sense.
An example of nonsensical is a story about a flying pink elephant jumping through a window.
unintelligible, foolish, silly, absurd, etc.
- Lacking intelligible meaning: a nonsensical jumble of words.
- Foolish; absurd: nonsensical ideas.
- non·sen′si·cal′i·ty non·sen′si·cal·ness
(comparative more nonsensical, superlative most nonsensical)
From nonsense +"Ž -ical.