consequential (adj.)youdaoicibaDictYouDict[consequential 词源字典]
1620s, from consequent (Latin consequentia) + -al (1). Meaning "pregnant with consequences, important" is recorded from 1728. Related: Consequentially (c. 1600).[consequential etymology, consequential origin, 英语词源]
inconsequential (adj.)youdaoicibaDictYouDict
"characterized by inconsequence," 1620s; "not worth noticing," 1782; see inconsequent + -al (1). Related: Inconsequentially.
sequential (adj.)youdaoicibaDictYouDict
1816, from Late Latin sequentia (see sequence) + -al (1). Related: Sequentially.