| improbably | (adverb) not easy to believe | Synonyms: implausibly, incredibly, unbelievably |
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| impromptu | (adjective) with little or no preparation or forethought | Synonyms: ad-lib, extemporaneous, extemporary, extempore, off-the-cuff, offhand, offhanded, unrehearsed |
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| (noun) an extemporaneous speech or remark | - |
| (noun) a short musical passage that seems to have been made spontaneously without advance preparation | - |
| (adverb) without advance preparation | Synonyms: ad lib, ad libitum, spontaneously |
| improper | (adjective) not suitable or right or appropriate | - |
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| (adjective) not appropriate for a purpose or occasion | Synonyms: wrong |
| (adjective) not conforming to legality, moral law, or social convention | Synonyms: unconventional, unlawful |
| improperly | (adverb) in an improper way | - |
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| improperness | (noun) an improper demeanor | Synonyms: impropriety |
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| impropriety | (noun) an act of undue intimacy | Synonyms: familiarity, indecorum, liberty |
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| (noun) an indecent or improper act | Synonyms: indecency |
| (noun) an improper demeanor | Synonyms: improperness |
| (noun) the condition of being improper | - |
| improvable | (adjective) susceptible of improvement | - |
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| improve | (verb) get better | Synonyms: ameliorate, better, meliorate |
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| (verb) to make better | Synonyms: ameliorate, amend, better, meliorate |
| improved | (adjective) made more desirable or valuable or profitable; especially made ready for use or marketing | - |
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| (adjective) become or made better in quality | - |
| (adjective) (of land) made ready for development or agriculture by clearing of trees and brush | - |
| improvement | (noun) the act of improving something | - |
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| (noun) a change for the better; progress in development | Synonyms: advance, betterment |
| (noun) a condition superior to an earlier condition | Synonyms: melioration |
| improver | (noun) a component that is added to something to improve it | Synonyms: add-on, addition |
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| (noun) someone devoted to the promotion of human welfare and to social reforms | Synonyms: do-gooder, humanitarian |
| improvidence | (noun) a lack of prudence and care by someone in the management of resources | Synonyms: shortsightedness |
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| improvident | (adjective) not provident; not providing for the future | - |
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| (adjective) not given careful consideration | Synonyms: ill-considered, ill-judged, shortsighted |
| improvidently | (adverb) in an improvident manner | - |
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| improving | (adjective) getting higher or more vigorous | Synonyms: up |
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| improvisation | (noun) an unplanned expedient | Synonyms: temporary expedient |
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| (noun) a performance given extempore without planning or preparation | Synonyms: extemporisation, extemporization |
| (noun) a creation spoken or written or composed extemporaneously (without prior preparation) | - |
| improvise | (verb) perform without preparation | Synonyms: ad-lib, extemporise, extemporize, improvize |
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| (verb) manage in a makeshift way; do with whatever is at hand | Synonyms: extemporize |
| improvised | (adjective) done or made using whatever is available | Synonyms: jury-rigged, makeshift |
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| improvize | (verb) perform without preparation | Synonyms: ad-lib, extemporise, extemporize, improvise |
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| inappropriate | (adjective) not suitable for a particular occasion etc | - |
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| (adjective) not in keeping with what is correct or proper | Synonyms: incompatible, out of keeping, unfitting |
| inappropriately | (adverb) in an inappropriate manner | Synonyms: unsuitably |
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| inappropriateness | (noun) the quality of being not particularly suitable or befitting | Synonyms: unworthiness |
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| (noun) inappropriate conduct | Synonyms: wrongness |
| iodoprotein | (noun) a protein that contains iodine | Synonyms: iodinated protein |
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| iproclozide | (noun) an antidepressant drug that acts as a monoamine oxidase inhibitor | - |
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| irreproachable | (adjective) free of guilt; not subject to blame | Synonyms: blameless, inculpable, unimpeachable |
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| irreproachably | (adverb) in an irreproachable and blameless manner | Synonyms: blamelessly |
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| irreproducibility | (noun) the quality of being unreproducible | - |
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| irreproducible | (adjective) impossible to reproduce or duplicate | Synonyms: unreproducible |
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| isopropanol | (noun) alcohol used as antifreeze or a solvent | Synonyms: isopropyl alcohol |
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| isoproterenol | (noun) drug (trade name Isuprel) used to treat bronchial asthma and to stimulate the heart | Synonyms: Isuprel |
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| ketoprofen | (noun) nonsteroidal anti-inflammatory drug (trade names Orudis or Orudis KT or Oruvail) | Synonyms: Orudis, Orudis KT, Oruvail |
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| leakproof | (adjective) not subject to leaks | - |
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| leprose | (adjective) rough to the touch; covered with scales or scurf | Synonyms: lepidote, scabrous, scaly, scurfy |
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| leprosy | (noun) chronic granulomatous communicable disease occurring in tropical and subtropical regions; characterized by inflamed nodules beneath the skin and wasting of body parts; caused by the bacillus Mycobacterium leprae | Synonyms: Hansen's disease |
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| leprous | (adjective) relating to or resembling or having leprosy | - |
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| lightproof | (adjective) not penetrable by light | Synonyms: light-tight |
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| lipoprotein | (noun) a conjugated protein having a lipid component; the principal means for transporting lipids in the blood | - |
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| lumpenproletariat | (noun) (Marxism) the unorganized lower levels of the proletariat who are not interested in revolutionary advancement | - |
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| malaprop | (noun) the unintentional misuse of a word by confusion with one that sounds similar | Synonyms: malapropism |
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| malapropism | (noun) the unintentional misuse of a word by confusion with one that sounds similar | Synonyms: malaprop |
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| malapropos | (adjective) of an inappropriate or incorrectly applied nature | - |
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| (adverb) at an inconvenient time | Synonyms: inopportunely |
| medroxyprogesterone | (noun) a progestin compound (trade name Provera) used to treat menstrual disorders | Synonyms: Provera |
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| meprobamate | (noun) a sedative and tranquilizer (trade name Miltown and Equanil and Meprin) used to treat muscle tension and anxiety | Synonyms: Equanil, Meprin, Miltown |
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| metaproterenol | (noun) a bronchodilator (trade name Alupent) used to treat asthma and emphysema and other lung conditions; available in oral or inhalant forms; side effects include tachycardia and shakiness | Synonyms: Alupent |
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| metoprolol | (noun) beta blocker (trade name Lopressor) used in treating hypertension and angina and arrhythmia and acute myocardial infarction; has adverse side effects (depression and exacerbation of congestive heart failure etc.) | Synonyms: Lopressor |
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| microprocessor | (noun) integrated circuit semiconductor chip that performs the bulk of the processing and controls the parts of a system | - |
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| misappropriate | (verb) appropriate (as property entrusted to one's care) fraudulently to one's own use | Synonyms: defalcate, embezzle, malversate, peculate |
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| misappropriated | (adjective) taken for your own use in violation of a trust | Synonyms: embezzled |
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| misappropriation | (noun) the fraudulent appropriation of funds or property entrusted to your care but actually owned by someone else | Synonyms: defalcation, embezzlement, misapplication, peculation |
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| (noun) wrongful borrowing | - |
| mispronounce | (verb) pronounce a word incorrectly | Synonyms: misspeak |
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| mispronunciation | (noun) incorrect pronunciation | - |
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| mothproof | (adjective) resistant to damage by moths | Synonyms: moth-resistant |
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| (verb) protect from moths | - |
| multiprocessing | (noun) simultaneous processing by two or more processing units | Synonyms: parallel processing |
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| multiprocessor | (noun) a computer that uses two or more processing units under integrated control | - |
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| multiprogramming | (noun) the execution of two or more computer programs by a single computer | Synonyms: concurrent execution |
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| naproxen | (noun) a nonsteroidal anti-inflammatory drug (trade name Naprosyn) used in the treatment of arthritis and musculoskeletal inflammation and moderate pain | Synonyms: Naprosyn |
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| nonproductive | (adjective) not directly productive | - |
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| nonprofessional | (adjective) not professional; not engaged in a profession or engaging in as a profession or for gain | - |
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| nonprofit | (adjective) not commercially motivated | Synonyms: non-profit-making |
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| (noun) an organization chartered for other than profit-making activities | Synonyms: nonprofit organization, not-for-profit |
| nonprognosticative | (adjective) not offering prognostications | - |
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| nonprogressive | (adjective) old-fashioned and out of date | Synonyms: fusty, standpat, unprogressive |
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| nonproliferation | (noun) the prevention of something increasing or spreading (especially the prevention of an increase in the number of countries possessing nuclear weapons) | Synonyms: non-proliferation |
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| nonproprietary | (adjective) not protected by trademark or patent or copyright | - |
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| nonprotractile | (adjective) not extensile | Synonyms: inextensible, nonextensile |
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| nonreciprocal | (adjective) not reciprocal | - |
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| nonreciprocating | (adjective) not moving alternately forward and backward | - |
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| nucleoprotein | (noun) any of several substances found in the nuclei of all living cells; consists of a protein bound to a nucleic acid | - |
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| opprobrious | (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: black, disgraceful, ignominious, inglorious, shameful |
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| (adjective) expressing offensive reproach | Synonyms: abusive, scurrilous |
| opprobrium | (noun) a state of extreme dishonor | Synonyms: infamy |
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| (noun) state of disgrace resulting from public abuse | Synonyms: obloquy |
| overproduce | (verb) produce in excess; produce more than needed or wanted | - |
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| (verb) produce in excess | - |
| overproduction | (noun) too much production or more than expected | Synonyms: overrun |
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| overprotect | (verb) protect excessively | - |
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| (verb) care for like a mother | Synonyms: fuss, mother |
| overprotection | (noun) excessive protection | Synonyms: momism, overshielding |
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| overprotective | (adjective) overly protective | - |
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| overproud | (adjective) excessively proud | - |
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| oxaprozin | (noun) a nonsteroidal anti-inflammatory drug (trade name Daypro) | Synonyms: Daypro |
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| paraprofessional | (noun) a trained worker who is not a member of a profession but who assists a professional | - |
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| phenylpropanolamine | (noun) an adrenergic drug used in many preparations to relieve allergic reactions or respiratory infections | - |
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| phosphoprotein | (noun) containing chemically bound phosphoric acid | - |
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| pitprop | (noun) a wooden prop used to support the roof of a mine | Synonyms: sprag |
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| polypropene | (noun) a polymer of propylene used as a thermoplastic molding material | Synonyms: polypropylene |
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| polypropenonitrile | (noun) acrylic resin used to make a strong soft crease-resistant fabric (trade name Acrilan) | Synonyms: Acrilan |
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| polypropylene | (noun) a polymer of propylene used as a thermoplastic molding material | Synonyms: polypropene |
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| pro | (adjective) in favor of (an action or proposal etc.) | - |
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| (noun) an argument in favor of a proposal | - |
| (noun) an athlete who plays for pay | Synonyms: professional |
| (adverb) in favor of a proposition, opinion, etc. | - |
| proaccelerin | (noun) a coagulation factor | Synonyms: accelerator factor, factor V, prothrombin accelerator |
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| proactive | (adjective) descriptive of any event or stimulus or process that has an effect on events or stimuli or processes that occur subsequently | - |
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| (adjective) (of a policy or person or action) controlling a situation by causing something to happen rather than waiting to respond to it after it happens | - |
| probabilism | (noun) (philosophy) the doctrine that (since certainty is unattainable) probability is a sufficient basis for belief and action | - |
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| (noun) a Roman Catholic system of casuistry that when expert opinions differ an actor can follow any solidly probable opinion that he wishes even though some different opinion might be more probable | - |
| probabilistic | (adjective) of or relating to or based on probability | - |
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| (adjective) of or relating to the Roman Catholic philosophy of probabilism | - |
| probabilistically | (adverb) by the use of probability theory | - |
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| probability | (noun) the quality of being probable; a probable event or the most probable event | - |
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| (noun) a measure of how likely it is that some event will occur; a number expressing the ratio of favorable cases to the whole number of cases possible | Synonyms: chance |
| probable | (adjective) likely but not certain to be or become true or real | - |
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| (adjective) apparently destined | - |
| (noun) an applicant likely to be chosen | - |
| probably | (adverb) with considerable certainty; without much doubt | Synonyms: belike, in all likelihood, in all probability, likely |
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| (adverb) easy to believe on the basis of available evidence | Synonyms: believably, credibly, plausibly |
| probate | (noun) the act of proving that an instrument purporting to be a will was signed and executed in accord with legal requirements | - |
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| (noun) a judicial certificate saying that a will is genuine and conferring on the executors the power to administer the estate | Synonyms: probate will |
| (verb) establish the legal validity of (wills and other documents) | - |
| (verb) put a convicted person on probation by suspending his sentence | - |
| probation | (noun) (law) a way of dealing with offenders without imprisoning them; a defendant found guilty of a crime is released by the court without imprisonment subject to conditions imposed by the court | - |
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| (noun) a trial period during which an offender has time to redeem himself or herself | - |
| (noun) a trial period during which your character and abilities are tested to see whether you are suitable for work or for membership | - |
| probationary | (adjective) under terms not final or fully worked out or agreed upon | Synonyms: provisional, provisionary, tentative |
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| probationer | (noun) someone released on probation or on parole | Synonyms: parolee |
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| (noun) a nurse in training who is undergoing a trial period | Synonyms: student nurse |
| probative | (adjective) tending to prove a particular proposition or to persuade you of the truth of an allegation | Synonyms: probatory |
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| probatory | (adjective) tending to prove a particular proposition or to persuade you of the truth of an allegation | Synonyms: probative |
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| probe | (noun) an exploratory action or expedition | - |
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| (noun) an investigation conducted using a flexible surgical instrument to explore an injury or a body cavity | - |
| (noun) a flexible slender surgical instrument with a blunt end that is used to explore wounds or body cavities | - |
| (noun) an inquiry into unfamiliar or questionable activities | Synonyms: investigation |
| (verb) question or examine thoroughly and closely | Synonyms: examine |
| (verb) examine physically with or as if with a probe | Synonyms: dig into, poke into |
| probenecid | (noun) a uricosuric drug that reduces the level of uric acid in the blood; used to treat gout | - |
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