Meaning
The kanji 考 (Kō / kangaeru) describes the mental process of logical thought and objective consideration. Unlike fleeting emotions, it represents a deliberate search for answers or a systematic investigation. Second-grade students learn this character as part of the Kyōiku Kanji, and it remains a vital component of the JLPT N4 level. It consists of 6 strokes and is categorized under the radical 耂 (oigashira), a variant of the radical for "old" (老).
Etymologically, 考 shares roots with the character for "old age" (老). The top portion, 耂, represents an elderly person with long hair. Below it, the component 丂 serves as a phonetic marker that originally suggested a sense of obstruction. This combination symbolically represents an elder digging deep into their wisdom to solve a problem. In ancient contexts, it often referred to the profound knowledge of ancestors. Modern Japanese maintains this nuance: 考える (kangaeru) implies logical or systematic thought. This distinguishes it from 思う (omou), which usually refers to feelings, beliefs, or spontaneous ideas.
Readings
On'yomi (音読み) — Chinese-derived readings
The on'yomi reading for 考 is コウ (kō). You will find this reading in formal, academic, and technical compounds. Because it uses a long vowel, be careful not to confuse it with the short "ko" sound during listening practice.
思考 (shikō) — The process of thinking or cognition. Professionals use this in psychology or philosophy to describe how the mind works.
参考 (sankō) — Reference or consultation. This is most common in the phrase 参考にする (to use as a reference) or when talking about 参考書 (reference books).
考古学 (kōkogaku) — Archaeology. This literally translates to the study of "investigating the old," which accurately describes the field.
Kun'yomi (訓読み) — Native Japanese readings
The kun'yomi reading is かんが.える (kanga.eru). This is a high-frequency verb used for planning, solving problems, or weighing options. The noun form, かんが.え (kanga.e), refers to a specific idea or a person's viewpoint.
考える (kangaeru) — To think about, consider, or contemplate. This is the active, transitive verb form used in daily life.
考え (kangae) — A thought, idea, or view. For example, 「いい考えがある」 (I have a good idea).
考え抜く (kangaenuku) — To think through thoroughly. The suffix -nuku adds the meaning of doing something to the very end with great effort.
Common Words & Compounds
The kanji 考 is used across various sectors. Here are some essential terms categorized by context.
Professional and Academic Contexts
考察 (kōsatsu) — Inquiry or study. You will see this in the "Discussion" or "Analysis" section of scientific reports.
考案 (kōan) — An invention or a new plan. It refers to the specific act of designing something through mental effort.
選考 (senkō) — Selection or screening. Companies use this term when evaluating job applicants or candidates for a prize.
Cognitive and Critical Thinking
再考 (sai-kō) — Reconsideration. This is used when a proposal needs to be reviewed or a decision needs to be changed.
思考力 (shikōryoku) — Thinking ability. Educators often use this term when discussing critical thinking skills in students.
熟考 (jukkō) — Careful deliberation. This implies taking significant time to weigh all possibilities before acting.
Daily Interactions
考え方 (kangaekata) — A way of thinking or a mindset. This is often used to describe someone's personal philosophy or perspective.
備考 (bikō) — Remarks or notes. This is a standard header on forms, invoices, and spreadsheets for providing extra context.
Example Sentences
ちょっと考えさせてください。
chotto kangaesasete kudasai.
Please let me think about it for a moment.
いい考えがあります。
ii kangae ga arimasu.
I have a good idea.
この本はとても参考になります。
kono hon wa totemo sankō ni narimasu.
This book is a very useful reference.
将来のことを真面目に考えています。
shōrai no koto wo majime ni kangaete imasu.
I am seriously thinking about my future.
一晩熟考してから返事をします。
hitoban jukkō shite kara henji wo shimasu.
I will reply after sleeping on it (reflecting overnight).
数学の問題を考えるのは楽しいです。
sūgaku no mondai wo kangaeru no wa tanoshii desu.
It is fun to work through math problems.
Related Kanji
- 弟 — Younger Brother, Junior (Kanji N4)
- 以 — By Means Of, With, From (Kanji N4)
- 黒 — Black, Dark (Kanji N4)
- 洗 — Wash (Kanji N4)
- 短 — Short, brief, defect (Kanji N4)
- 田 — Rice Field (Kanji N4)
Memory Tip
Think of the top part (耂) as an elderly person with a cane, representing long years of experience. The bottom part (丂) looks like a hook or a question mark that has been slightly straightened. Combine them: an old, wise person using their logic to "hook" onto the truth or straighten out a complex problem. To remember the difference between 考 and 思 (think), remember that 考 (logic) uses the radical for "old age," while 思 (feeling) uses the radical for "heart."