v. [UNDER-1 10 a, 4 b.]
† 1. trans. To think too little of, to underestimate.
a. 1623. Buck, Rich. III. (1616), 52. Charles was so overweening of his owne judgement, that he under-thought all mens else.
2. intr. To think insufficiently.
1711. Shaftesb., Charac., III. 301. They might rather thank themselves, for having under-thought, or reasond short, so as to rest satisfyd with a very superficial Search.
3. trans. To penetrate under by thinking.
1886. A. Weir, Hist. Basis Mod. Europe (1889), 491. Man can to some degree return upon his thought, can to some extent underthink the conditions of cognition.