6

There are several words I've found that end in っぱち. Does the suffix have any special meaning, like がち?

「やけっぱち」
「うそっぱち」
「でこっぱち」

It also seems that these are na-adjectives, and it is possible to add さ (for at least some of them) to turn them into nouns. Is this addition possible for all っぱち adjectives?

4

There is no special meaning. As one of the linked entries says:

※「~ぱち」は語感に勢いをつけたり、意味を強調するもので、これ自体に意味はない。また、これを付けることで、特に意味が変わるものでもない。

I guess these might be originally coined as a wordplay so that it sounds like a person's name. ~はち/~ぱち (八) was a typical male name-suffix in the Edo period (eg 甚八, 新八). Since ancient times Japanese people often created meaningless phrases just because they sound nice (examples).

I don't think でこっぱち ("forehead") can serve as a na-adjective. For やけっぱち and うそっぱち, it's technically possible to add さ, but it's not common because they already have intense meanings (you don't hear 最高さ often, either).

2

They are all used as intensifiers for noun there. Therefore っぱち itself doesn't have special meanings like がち(serious?)

Since やけ, うそ and でこ are nouns not adjectivals(na-adjective), You can't add さ to nominalize them.

  • Naruto-san. I think you should note that there are discussion on derivation of っぱち. To my knowledge,うそっぱちcan be abbreviation of 嘘八百 and やけっぱち – Wataru 'Watson' Subridge Feb 15 '17 at 14:04

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