"one who conceals his opinions, character, etc., under a false appearance, one who pretends that a thing which is is not," 1520s, agent noun from dissemble. "A dissembler is one who tries to conceal what he is; a hypocrite, one who tries to make himself appear to be what he is not, especially to seem better than he is." [Century Dictionary]

also over-educated, "educated to excess or too long or beyond what is necessary," 1788, from over- + educated.

"by what, by which," c. 1200, from where (in the sense of "in which position or circumstances") + by.

"not equal to what is required, insufficient to effect the end desired," 1670s; see in- (1) "not, opposite of" + adequate. Related: Inadequately.

c. 1600, "doubtful, questionable, uncertain, unsettled," from French problematique (15c.), from Late Latin problematicus, from Greek problēmatikos "pertaining to a problem," from problēmatos, genitive of problēma (see problem).

Specific sense in logic, differentiating what is possible from what is necessarily true, is from 1610s. The sense of "constituting, containing, or causing a difficulty" is modern, probably from a noun use in sociology (1957). Related: Problematical (1560s); problematically.

late 14c., oddenesse, "unevenness of number," from odd + -ness. Meaning "strangeness, queerness, divergence from what is ordinary or useful" is from 1610s.

"more than human, beyond what is human," 1803, from preter- "beyond" + human (adj.). Used to avoid the specific connotations of superhuman.

"beyond what is permitted by the marriage tie or vow," hence, euphemistically, "adulterous," 1833 (Carlyle), from preter- "beyond" + nuptial.