Translation needed please.

tsuini yatte shimatta

does that mean ''Finally done?'' or something similar?

Is that a sentence you could use when you finally finish a huge workload?

Thanks

tsuini yatte shimatta

The sentence structure "(...te) shimatta" means "(I've) done it," but with a sense of regret, with a bit of sense of "unfortunately" in it. So if said in a normal conversation, this is something you'd say, for example, if sometime ago you bought a beautiful tall glass vase, which you were from the start afraid you might break some day, and one day you knock it over... whoops!! THen you might say this. Shucks, after all, I did it.

At times, this "...te shimatta" might be used as part of advertisement line for something new and unexpected, just to catch people's attention.

Is that a sentence you could use when you finally finish a huge workload?
That would be "Yatto owaraseta," "Finally I've complete it" or something like that :)

If you want to say "Finally done",

Tsui ni yatta

is the suitable expression.

"Tsui ni yatte shimatta" sounds like you've done something you didn't want to for a long time.

Thanks, that makes it a lot more clear for me :P

this can also be translated in a way as "I finally did it."=tsui ni yatta.