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I can think of many gairaigo noun + する verbs in Japanese, like ゴルフする, but I
can think of only a handful of non-する verbs in Japanese, such as ググる
(mentioned in [Are there words which consist of katakana and hiragana letters
together?](https://japanese.stackexchange.com/questions/15199/are-there-words-
which-consist-of-katakana-and-hiragana-letters-together)), and they appear to
be a bit slangy in nature.

Why are there very few non-する verbs in Japanese? I can think of a few
hypotheses, but no way of testing them:

  * There are far fewer new verbs in Japanese than there are new nouns, so most Japanese verbs were created before gairaigo was a major influence on Japanese.
  * gairaigo words are somehow unsuitable for inflection, such that while they can be incorporated into the language as する verbs, as nouns don't get inflected, it's impractical to make them an inflected verb
  * gairaigo words are somehow more acceptable as nouns than as verbs

I found a
[claim](https://en.wikipedia.org/wiki/Japanese_grammar#Word_class_system) in
Wikipedia that in Japanese, verbs are a "closed class", which do not easily
accept new members. Elsewhere it claims that not only
[gairaigo](https://en.wikipedia.org/wiki/Gairaigo#Grammatical_function) but
also [kango](https://en.wikipedia.org/wiki/Sino-Japanese_vocabulary)
contribute very few non-する verbs.

Side question: Are there fewer newly created verbs in Japanese than newly
created nouns? Also, are there nouns that are mainly used as する verbs rather
than by themselves?

Related questions:

  * [Are there words which consist of katakana and hiragana letters together?](https://japanese.stackexchange.com/questions/15199/are-there-words-which-consist-of-katakana-and-hiragana-letters-together) (not all gairaigo uses katakana, so it's possible that there may be non-する verbs that wouldn't be addressed in that question)
  * [Are foreign adjectives always な adjectives?](https://japanese.stackexchange.com/questions/2497/are-foreign-adjectives-always-%E3%81%AA-adjectives) (い versus non-い adjectives is reminiscent of non-する versus する verbs)
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question
verbs loanwords wago-and-kango
Why are there very few non-する gairaigo verbs in Japanese?
I think that the "noun" parts of _suru_ verbs "feel" very much like verbs
themselves — the する is only needed for inflection and may be omitted as for
example in 体言止め _taigendome_ used in newspaper headlines.

Most _suru_ verbs are derived from Chinese loanwords. Loaning a verb from a
non-Chinese language and adding する for inflection purposes follows exactly the
same pattern, so I don't find it surprising at all that it would be the norm
for verb loans from all languages.

(I have also observed that native Japanese speakers who are learning a foreign
language will use this pattern for verbs from other languages, speaking
essentially Japanese spiced with vocabulary from this foreign language.
Likewise, children who are native speakers of both Japanese and another
language might incorporate a foreign verb +する as a loanword in this way.)

I find it more surprising that there exist loaned verbs, which do not follow
this pattern.

Verbs like ダブる, ググる, etc. are reanalyzing ル of ダブル, グーグル, etc. whereas サボる,
ミスる, スタンバる, etc. don't even rely on such a reanalysis and are "true" non-
_suru_ verbs which are also _gairaigo_.

But that these are rare is consistent with the fact that the usual rule seems
to be "loaned verbs follow the pattern [verb]+する".
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answer