improper vs ithyphallic

improper

adj
  • Not in keeping with conventional mores or good manners; indecent or immodest 

  • unsuitable to needs or circumstances; inappropriate; inapt 

  • Not properly named; See, for example, improper fraction 

  • Not consistent with established facts; incorrect 

  • Of a complex random variable, correlated with its conjugate 

  • Not according to facts; inaccurate or erroneous 

ithyphallic

adj
  • Lascivious, obscene. 

  • Pertaining to a metrical combination of two trochees followed by one spondee. 

  • Of a poem or song: having the metre of an ode sung in honour of the bacchic phallus. 

  • Of or pertaining to an upward pointing, erect penis; (specifically) of an artistic depiction of a deity or other figure: possessing an erect penis. 

  • Of or pertaining to the erect phallus that was carried in bacchic processions. 

noun
  • A poem or song in an ithyphallic metre. 

  • A lascivious or obscene poem or song. 

How often have the words improper and ithyphallic occurred in a corpus of books? (source: Google Ngram Viewer )