That guy doesn't know the meaning of the word harmony.とは 意味・読み方・使い方

It does not convey the exact meaning of the original word.

He had no [little] idea what these words meant.

a dark passage

He doesn't know what it is to be poor.

I can make nothing of it.

There is no sense [not much point] in doing that.

words empty of meaning

I cannot get (at) its exact meaning.

No two words are identical in meaning.

This word does not have any such meaning.

emit inarticulate sounds

That one word speaks volumes.

The child does not even know how to add.

It is important to guess the meaning of unknown words from the context.

The word does not convey such a meaning.

The origin of this word is unknown.

The boy doesn't know how to behave.

I don't understand the meaning of this word.

I am not familiar with this word.

I won't fall for your [his] sweet talk [honeyed words].

I am unclear about which word means that.

Like is hardly the word.

all words and no sense

Young people nowadays have no manners.

It does not make sense.

There is no proper [satisfactory] Japanese equivalent for this word.

I cannot sense your meaning.

What kind of talk is that?[!]

It is hard to define this word.

This is a failure as a dictionary.