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In response to my
[question](https://japanese.stackexchange.com/questions/6378/the-logic-
behind-%E3%81%8F%E3%81%99%E3%81%90%E3%81%A3%E3%81%9F%E3%81%84) about くすぐったい, I
was told of the specific suffix in use, the "ったい." What is this ったい / -ttai
suffix called in English and in Japanese (or what would one call it if it does
not have a specific name)? What exactly does it connote? Would someone be kind
enough to provide me with a brief list of Japanese words using this suffix? (I
found Dono's romanization hard to understand {sorry})
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question
grammar
What is the ったい / -ttai suffix called?
Some from a standard dictionary (using ending-by search) 厚{あつ}ぼったい (thick),
はれぼったい (puffy), 口{くち}幅{はば}ったい (bragging), じれったい (impatient), 平{ひら}べったい (flat),
野暮{やぼ}ったい (uncouth).

It's interesting to me how many of these have a ば row kana before the ったい, and
ぼったい appears in the
[dictionary](http://dic.yahoo.co.jp/dsearch?enc=UTF-8&p=%E3%81%BC%E3%81%A3%E3%81%9F%E3%81%84&dtype=0&dname=0ss&stype=0),
as being something that attaches to the stem of a i-adjective or verb
(basically as a strengthener).

This form seems common in 遠州弁{えんしゅうべん}, for example as in [this
site](http://homepage3.nifty.com/hachimankotoh/koitai.html) which splits the
words into plain ったい and ぼったい ending versions, and also in 静岡弁{しずおかべん}.
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answer
Reading your conversation with Tsuyoshi ito in the comments, I guess you are
asking whether -ttai is a derivational affix or an inflectional one. It is a
derivational one.
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answer