Wow. I leave the thread for a few minutes, and I garner three responses! I am laughing about the "head spinning" part. Here's the first part of my investigation; let's start with definitions!
im·per·fect
Function: adjective
Etymology: alteration of Middle English imperfit, from Middle French imparfait, from Latin imperfectus, from in- + perfectus perfect
1 : not perfect: as a : DEFECTIVE b of a flower : having stamens or pistils but not both c : lacking or not involving sexual reproduction <the imperfect stage of a fungus>
2 : of, relating to, or constituting a verb tense used to designate a continuing state or an incomplete action especially in the past
3 : not enforceable at law
de·fec·tive
Function: adjective
1 a : imperfect in form or function : FAULTY <a defective pane of glass> b : falling below the norm in structure or in mental or physical function <defective eyesight>
2 : lacking one or more of the usual forms of grammatical inflection <must is a defective verb>
- de·fec·tive·ly adverb
- de·fec·tive·ness noun
sin Function: noun
Etymology: Middle English sinne, from Old English synn; akin to Old High German sunta sin and probably to Latin sont-, sons guilty, est is -- more at IS
1 a : an offense against religious or moral law b : an action that is or is felt to be highly reprehensible <it's a sin to waste food> c : an often serious shortcoming : FAULT
2 a : transgression of the law of God b : a vitiated state of human nature in which the self is estranged from God
synonym see OFFENSE
faultFunction: noun
Etymology: Middle English faute, from Middle French, from (assumed) Vulgar Latin fallita, from feminine of fallitus, past participle of Latin fallere to deceive, disappoint
1 obsolete : LACK
2 a : WEAKNESS, FAILING; especially : a moral weakness less serious than a vice b : a physical or intellectual imperfection or impairment : DEFECT c : an error especially in service in a net or racket game
3 a : MISDEMEANOR b : MISTAKE
4 : responsibility for wrongdoing or failure <the accident was the driver's fault>
5 : a fracture in the crust of a planet (as the earth) or moon accompanied by a displacement of one side of the fracture with respect to the other usually in a direction parallel to the fracture
- at fault 1 : unable to find the scent and continue chase 2 : open to blame : RESPONSIBLE <couldn't determine who was really at fault>
- to a fault : to an excessive degree <precise to a fault>
synonyms FAULT, FAILING, FRAILTY, FOIBLE, VICE mean an imperfection or weakness of character. FAULT implies a failure, not necessarily culpable, to reach some standard of perfection in disposition, action, or habit <a writer of many virtues and few faults>. FAILING suggests a minor shortcoming in character <being late is a failing of mine>. FRAILTY implies a general or chronic proneness to yield to temptation <human frailties>. FOIBLE applies to a harmless or endearing weakness or idiosyncrasy <an eccentric's charming foibles>. VICE can be a general term for any imperfection or weakness, but it often suggests violation of a moral code or the giving of offense to the moral sensibilities of others <compulsive gambling was his vice>.