From classical Japanese 勘がへる (*kangafu), combining 勘 (kan, "intuition; sense") with 替へる (kafu, "to change; to consider alternately"). The modern form 考える settled in the Edo period, shifting from the classical 考ふ (kangafu). The kanji 考 itself is shared with the Chinese concept of "examining" or "verifying," and appears in words like 考察 (kōsatsu, "investigation").

In Japanese communication culture, taking visible time to 考える before answering is often seen as respectful and conscientious — unlike in some Western contexts where a quick response signals confidence. The phrase よく考えます ("I will think it over carefully") is also a common, polite way to decline a request without saying no directly.