(n.) Behavior like that of a bear.

abruptness aggressiveness bearishness beastliness bluntness boorishness brachylogy brashness brevity briefness brusqueness brusquerie churlishness compactness compendiousness conciseness concision crispness crustiness dumbness economy of words gruffness harshness instantaneousness laconicalness laconism littleness lowness muteness nastiness obmutescence pauciloquy pithiness pointedness quietness quietude reserve roughness sententiousness severity sharpness short time shortness silence sparingness of words speechlessness succinctness summariness surliness taciturnity terseness transience truculence unloquaciousness untalkativeness wordlessness