その話はなし、なんか疑うたがわしいなあ。

sono hanashi, nanka utagawashii naa.

That story sounds kind of doubtful to me. casual

彼かれの説明せつめいには疑うたがわしい点てんがいくつかありました。

kare no setsumei ni wa utagawashii ten ga ikutsuka arimashita.

There were several doubtful points in his explanation. neutral