- antithetical (adj.)
- 1580s, from Greek antithetikos "setting in opposition," from antithetos "placed in opposition" (see antithetic) + -al (1). Related: Antithetically.
- hypothetical (adj.)
- 1580s, from Greek hypothetikos "pertaining to a hypothesis," from hypothesis (see hypothesis). Related: Hypothetically; hypothetic.
- parenthetical (adj.)
- 1620s, from Medieval Latin parentheticus from Greek parenthetos "put in beside," verbal adjective from parentithenai; see parenthesis) + -al (1). Related: Parenthetically.