WordNet sense 1 (a cruel and brutal fellow):

hooligan, roughneck, rowdy, ruffian, tough, yob, yobbo, yobo

WordNet sense 2 (be bossy towards):

browbeat, hector, strong-arm, ballyrag, bullyrag, boss around, push around

WordNet sense 3 (very good):

dandy, great, groovy, keen, neat, nifty, peachy, smashing, swell, corking, cracking, slap-up, bang-up, not bad

WordNet sense 4 (discourage or frighten with threats or a domineering manner; intimidate):

swagger