imperfect vs unmarked

imperfect

adj
  • not perfect 

  • belonging to a tense of verbs used in describing a past action that is incomplete or continuous 

  • known or expected to be polyphyletic, as of a form taxon. 

  • unisexual: having either male (with stamens) or female (with pistil) flowers, but not with both. 

verb
  • to make imperfect 

noun
  • something having a minor flaw 

  • a tense of verbs used in describing a past action that is incomplete or continuous 

unmarked

adj
  • Not marked; not standing out as unusual. 

  • Not bearing identification. 

  • Not noticed. 

  • Free from blemishes. 

  • Not marked, not closely followed by a defensive player. 

  • Not having been marked, or assigned a score. 

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