iactans

Etymology
Present active participle of

Participle

 * 1) throwing, casting, hurling
 * 2) scattering, tossing
 * 3)  disturbing, disquieting
 * 4) uttering, speaking, throwing out
 * 5) hurling insults, insulting
 * 6) boasting, boastful, acting conceitedly
 * 7) being officious

Adjective

 * 1) arrogant
 * 2) boastful