NONSENSICAL
nonsensical, nonsense(a)
(adjective) having no intelligible meaning; “nonsense syllables”; “a nonsensical jumble of words”
absurd, cockeyed, derisory, idiotic, laughable, ludicrous, nonsensical, preposterous, ridiculous
(adjective) so unreasonable as to invite derision; “the absurd excuse that the dog ate his homework”; “that’s a cockeyed idea”; “ask a nonsensical question and get a nonsensical answer”; “a contribution so small as to be laughable”; “it is ludicrous to call a cottage a mansion”; “a preposterous attempt to turn back the pages of history”; “her conceited assumption of universal interest in her rather dull children was ridiculous”
Source: WordNet® 3.1
Etymology
Adjective
nonsensical (comparative more nonsensical, superlative most nonsensical)
Without sense; absurd.
Synonyms: meaningless, unmeaning, absurd, foolish, irrational, preposterous
Antonyms: logical, rational, sensical
Source: Wiktionary
Non*sen"si*cal, a.
Definition: Without sense; unmeaning; absurb; foolish; irrational;
preposterous.
– Non*sen"si*cal*ly, adv.
– Non*sen"si*cal*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition