| BEETLEBRAINS | • beetlebrains n. Plural of beetlebrain. • BEETLEBRAIN n. a heavy stupid person, also BEETLEHEAD. | 
| BETWEENBRAIN | • betweenbrain n. Alternative form of ’tweenbrain. • BETWEENBRAIN n. the diencephalon. | 
| BRAININESSES | • BRAININESS n. the quality of being brainy. | 
| BRAINSTORMED | • brainstormed v. Simple past tense and past participle of brainstorm. • brain-stormed v. Simple past tense and past participle of brain-storm. • brain␣stormed v. Simple past tense and past participle of brain storm. | 
| BRAINSTORMER | • brainstormer n. One who brainstorms. • BRAINSTORMER n. one who engages in brainstorming. | 
| BRAINTEASERS | • brainteasers n. Plural of brainteaser. • brain-teasers n. Plural of brain-teaser. • BRAINTEASER n. something (as a puzzle) that demands mental effort and acuity for its solution. | 
| BRAINWASHERS | • brainwashers n. Plural of brainwasher. • BRAINWASHER n. one who brainwashes. | 
| BRAINWASHING | • brainwashing n. Alternative spelling of brain-washing. • brainwashing v. Present participle of brainwash. • brain-washing n. A form of indoctrination that forces people to abandon their beliefs in favour of another set of beliefs… | 
| CRACKBRAINED | • crackbrained adj. Idiotic. • CRACKBRAINED adj. of or like a crackbrain, a crazy person. | 
| FEATHERBRAIN | • featherbrain n. Alternative spelling of feather-brain. • feather-brain n. (Derogatory) a feather-brained or stupid person, especially a woman. • FEATHERBRAIN n. a foolish scatterbrained person. | 
| RATTLEBRAINS | • rattlebrains n. Plural of rattlebrain. • RATTLEBRAIN n. a shallow, voluble, volatile person. | 
| SCATTERBRAIN | • scatterbrain n. A flighty, disorganized or forgetful person. • SCATTERBRAIN n. a giddy heedless person. |