| acrobatic | (adjective) vigorously active | Synonyms: athletic, gymnastic |
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| aerobic | (adjective) depending on free oxygen or air | Synonyms: aerophilic, aerophilous |
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| (adjective) based on or using the principles of aerobics; enhancing respiratory and circulatory efficiency | - |
| aerobiotic | (adjective) living or active only in the presence of oxygen | - |
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| agrobiologic | (adjective) of or pertaining to agrobiology | Synonyms: agrobiological |
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| agrobiological | (adjective) of or pertaining to agrobiology | Synonyms: agrobiologic |
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| anaerobic | (adjective) living or active in the absence of free oxygen | Synonyms: anaerobiotic |
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| (adjective) not aerobic | - |
| anaerobiotic | (adjective) living or active in the absence of free oxygen | Synonyms: anaerobic |
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| antimicrobial | (adjective) capable of destroying or inhibiting the growth of disease-causing microorganisms | Synonyms: antimicrobic |
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| antimicrobic | (adjective) capable of destroying or inhibiting the growth of disease-causing microorganisms | Synonyms: antimicrobial |
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| approbative | (adjective) expressing or manifesting praise or approval | Synonyms: affirmative, approbatory, approving, plausive |
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| approbatory | (adjective) expressing or manifesting praise or approval | Synonyms: affirmative, approbative, approving, plausive |
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| corroborant | (adjective) used of a medicine that is strengthening | - |
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| corroborative | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroboratory, substantiating, substantiative, validating, validatory, verificatory, verifying |
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| corroboratory | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroborative, substantiating, substantiative, validating, validatory, verificatory, verifying |
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| equiprobable | (adjective) equally probable | - |
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| improbable | (adjective) not likely to be true or to occur or to have occurred | Synonyms: unlikely |
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| (adjective) having a probability too low to inspire belief | Synonyms: unbelievable, unconvincing, unlikely |
| (adjective) too improbable to admit of belief | Synonyms: marvellous, marvelous, tall |
| katharobic | (adjective) of living being in an oxygenated environment lacking organic matter | - |
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| macrobiotic | (adjective) of or relating to the theory or practice of macrobiotics | - |
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| metagrobolised | (adjective) totally perplexed and mixed up | Synonyms: metagrabolised, metagrabolized, metagrobolized, mystified |
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| metagrobolized | (adjective) totally perplexed and mixed up | Synonyms: metagrabolised, metagrabolized, metagrobolised, mystified |
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| microbial | (adjective) of or involving or caused by or being microbes | Synonyms: microbic |
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| microbic | (adjective) of or involving or caused by or being microbes | Synonyms: microbial |
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| neurobiological | (adjective) of or relating to the biological study of the nervous system | - |
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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 |
| 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 | - |
| probable | (adjective) likely but not certain to be or become true or real | - |
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| (adjective) apparently destined | - |
| probationary | (adjective) under terms not final or fully worked out or agreed upon | Synonyms: provisional, provisionary, tentative |
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| 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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| probing | (adjective) diligent and thorough in inquiry or investigation | Synonyms: inquisitory, searching |
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| problematic | (adjective) making great mental demands; hard to comprehend or solve or believe | Synonyms: baffling, elusive, knotty, problematical, tough |
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| (adjective) open to doubt or debate | Synonyms: debatable, problematical |
| problematical | (adjective) making great mental demands; hard to comprehend or solve or believe | Synonyms: baffling, elusive, knotty, problematic, tough |
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| (adjective) open to doubt or debate | Synonyms: debatable, problematic |
| reprobate | (adjective) deviating from what is considered moral or right or proper or good | Synonyms: depraved, perverse, perverted |
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| robed | (adjective) dressed or clothed especially in fine attire; often used in combination | Synonyms: appareled, attired, dressed, garbed, garmented, habilimented |
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| robotic | (adjective) of or relating to mechanical robots | - |
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| (adjective) resembling the unthinking functioning of a machine | Synonyms: automatic, automatonlike, machinelike, robotlike |
| robotlike | (adjective) resembling the unthinking functioning of a machine | Synonyms: automatic, automatonlike, machinelike, robotic |
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| robust | (adjective) sturdy and strong in form, constitution, or construction | - |
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| (adjective) strong enough to withstand or overcome intellectual challenges or adversity | - |
| (adjective) marked by richness and fullness of flavor | Synonyms: full-bodied, racy, rich |
| (adjective) rough and crude | - |
| robustious | (adjective) noisy and lacking in restraint or discipline | Synonyms: boisterous, rambunctious, rumbustious, unruly |
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| saprobic | (adjective) living in or being an environment rich in organic matter but lacking oxygen | - |
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| throbbing | (adjective) pounding or beating strongly or violently | - |
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| uncorroborated | (adjective) unsupported by other evidence | Synonyms: unsubstantiated |
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| unproblematic | (adjective) easy and not involved or complicated | Synonyms: elementary, simple, uncomplicated |
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