TAKOBOTO

without thinking, despite myself
oops, i said too much!

ひみつでしたか？ついうっかりちょうちゃいました。

It was a secret? Oops! I spoke about it without thinking...

ついかっちゃった！

Damn! I went and bought it (and I shouldn't have).

つい「コンピュータがおかしい」とおもってしまいます．でも，コンピュータがわがおかしいことはまずありません．

I carelessly thought "There's something up with the computer". But actually there was nothing up with the _computer_ side.

ついさきほどしぐれた

We had a light shower a while ago.

ついひつようなワードフィルをさくじょしてしまった。

I just (unintentional) deleted an important word file.

かれはついじぶんのなまえをいってしまった。

He carelessly said his name.

かれはたいへんまずいことをついいってしまった。

He slip a very unfortunate remark.

かのじょはまずしさのあまりついぬすみをはたらいた。

Poverty implied her to steal.

Also means, just (now), or recently.

KotatsuSama

I always thought that was ついに？ Am I wrong or can you drop the に？

huess

ついに is different from つい.
ついに can be replaced with やっと at last
ついに買っちゃった！
Finally, I got it!

Miki

「つい」and「ついに」is different.

「つい」means... "regretfully"
for example, you go shopping, you find a new PC. you already have a PC, but you buy the spanky new one anyway. then, you say
「つい、買った。」
in fact, you don't need that PC.

「ついに」means..."at last"
you wanted a PC for a long time, and eventually you get one. then, you say,
「ついに買った。」
you really need that PC.

:( tsui = ukkari
:) tsuini = yatto

hiro

Inadvertantly, unintentionally, etc.

Amatuka

ex1273 seems different from the others?

dc

Yes. The つい means すぐ。This emphases something happens very close in time/distance.
つい２、３時間前に as recently as a few hours
ついそこまで休憩に行ってきました。I went right over there for break.

Miki

'tsui',according to me is used when you get indulged in your inner feelings so much that you forget what is going around.
ex-夢中で、つい大きい声で歌ってしまって、はずかしかった。

ashishjoshi

Is "tsui" an interjection like "tsk" or "tsch"?

DrJones