The word "in sanenesses" is a complex spelling that comprises four syllables. The first syllable "in" is pronounced as /ɪn/. The second syllable "san" is pronounced as /sæn/, and the third syllable "e" is pronounced as /i/. The fourth syllable "nesses" is pronounced as /nəsɪz/. It means the state of being insane or crazy. It is a challenging word to spell due to its complexity, but by breaking it down into syllables and using phonetic transcription, it can be easier to understand and remember.