| abreast | (adjective) being up to particular standard or level especially in being up to date in knowledge | Synonyms: au courant, au fait, up on |
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| backbreaking | (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: arduous, grueling, gruelling, hard, heavy, laborious, operose, punishing, toilsome |
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| breakable | (adjective) capable of being broken or damaged | - |
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| breakaway | (adjective) having separated or advocating separation from another entity or policy or attitude | Synonyms: fissiparous, separatist |
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| breakneck | (adjective) moving at very high speed | - |
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| breasted | (adjective) having a breast or breasts; or breasts as specified; used chiefly in compounds | - |
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| breastless | (adjective) without a breast | - |
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| breathed | (adjective) uttered without voice | Synonyms: voiceless |
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| breathing | (adjective) passing or able to pass air in and out of the lungs normally; sometimes used in combination | Synonyms: eupneic, eupnoeic |
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| breathless | (adjective) not breathing or able to breathe except with difficulty | Synonyms: dyspneal, dyspneic, dyspnoeal, dyspnoeic |
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| (adjective) appearing dead; not breathing or having no perceptible pulse | Synonyms: inanimate, pulseless |
| (adjective) tending to cause suspension of regular breathing | Synonyms: breathtaking |
| breathtaking | (adjective) tending to cause suspension of regular breathing | Synonyms: breathless |
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| groundbreaking | (adjective) being or producing something like nothing done or experienced or created before | Synonyms: innovational, innovative |
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| heartbreaking | (adjective) causing or marked by grief or anguish | Synonyms: grievous, heartrending |
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| unbreakable | (adjective) impossible to break especially under ordinary usage | - |
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