IPA: //nɒnˈsɛnsɪkəl.nəs//
KK: /nɑnˈsɛnsɪkəlnəs/
The quality or state of being nonsensical; something that does not make sense or is absurd.
The nonsensicalness of his argument left everyone confused.
Nonsensicalness → It is formed from "non-" (meaning not), "sensical" (from Latin "sensus", meaning sense or meaning), and "-ness" (meaning the state of being). The word describes the state of being not sensible or lacking meaning.
Think of 'not' ('non-') combined with 'sense' ('sensical') to remember that 'nonsensicalness' refers to the state of lacking sense.
No commonly confused words.