Why do JLPT N1 learners confuse 平たい with 名高い?

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 平たい or 名高い more common on JLPT N1?

Both appear in the JLPT N1 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 General Adjectives (2) theme of N1 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 N1 · Advanced · Meaning confusion

平たい vs 名高い

Q: What's the difference between 平たい and 名高い?

平たい (ひらたい) means "flat; even; level; simple; plain" and 名高い (なだかい) means "famous, celebrated, well-known". These are conceptual opposites regarding status. 平たい (flat/level) implies something 'ordinary' or simple, whereas 名高い implies something 'famous' or distinguished. Both describe the 'profile' of an object.

Why JLPT N1 learners mix up 平たい (ひらたい, “flat; even; level; simple; plain”) and 名高い (なだかい, “famous, celebrated, well-known”).

平たい

ひらたい

flat; even; level; simple; plain

i-adjective

名高い

なだかい

famous, celebrated, well-known

i-adjective

Theme: General Adjectives (2)JLPT N1

Why these get confused

These are conceptual opposites regarding status. 平たい (flat/level) implies something 'ordinary' or simple, whereas 名高い implies something 'famous' or distinguished. Both describe the 'profile' of an object.

How to tell them apart

Anchor on the meaning, not the form. 平たい (flat; even; level; simple; plain) and 名高い (famous, celebrated, well-known) 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

平たい (flat; even; level; simple; plain)

彼は全部平らげた。
どうぞ、お平らに。

名高い (famous, celebrated, well-known)

あの男はギャンブラーとして悪名高い。
ナイアガラの滝は世界有数の観光地として名高い。

How JLPT tests this pair

On JLPT N1, 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

「平たい」の意味は？