Why do JLPT N2 learners confuse 平気 with 偶数?

Both words occupy adjacent semantic territory, which is exactly why the JLPT uses them as distractors for each other on multiple-choice items. The fastest way to stop confusing them is to study them as a pair, write a one-sentence contrast in your own words, and drill the pair specifically rather than each word in isolation.

Is 平気 or 偶数 more common on JLPT N2?

Both appear in the JLPT N2 curriculum and either may show up on a given exam. Don't try to predict which one the test will choose — learn to distinguish them and you'll be safe regardless. Both belong to the Emotions & Mental States theme of N2 vocabulary.

How do I practice this confusion pair?

Free option: visit /try and pick a confusion drill. Paid option: none — JLPT Mastery is free during launch. Whichever route you take, the engine specifically re-tests pairs you've gotten wrong rather than rotating through general vocabulary review.

JLPT N2 · Upper Intermediate · Meaning confusion

平気 vs 偶数

Q: What's the difference between 平気 and 偶数?

平気 (へいき) means "coolness, calmness, composure, unconcern" and 偶数 (ぐうすう) means "even number". The kanji 平 (flat/even) in 'Heiki' conceptually overlaps with the 'even' in 'Guusuu' (even number). Learners may confuse 'composure' (even-tempered) with the mathematical concept of 'even numbers'.

Why JLPT N2 learners mix up 平気 (へいき, “coolness, calmness, composure, unconcern”) and 偶数 (ぐうすう, “even number”).

平気

へいき

coolness, calmness, composure, unconcern

na-adjective

偶数

ぐうすう

even number

na-adjective

Theme: Emotions & Mental StatesJLPT N2

Why these get confused

The kanji 平 (flat/even) in 'Heiki' conceptually overlaps with the 'even' in 'Guusuu' (even number). Learners may confuse 'composure' (even-tempered) with the mathematical concept of 'even numbers'.

How to tell them apart

Anchor on the meaning, not the form. 平気 (coolness, calmness, composure, unconcern) and 偶数 (even number) live in adjacent semantic territory. Memorize the boundary, not just each word.
Read the example sentences below. Seeing each word in its natural context builds a faster lookup than studying the dictionary form alone.

In a sentence

平気 (coolness, calmness, composure, unconcern)

平気だよ。
平気だよ。

偶数 (even number)

１２は偶数である。
あらゆる偶数は、二つの素数の和です。

How JLPT tests this pair

On JLPT N2, this pair shows up as a vocabulary meaning question. You see one word and pick its English equivalent from four options — one of which will be the other word in this pair, chosen as a distractor precisely because of the overlap.

Sample item

「平気」の意味は？