Way 1 · best default
I'm a little frustrated
You name the feeling honestly, but "a little" keeps the temperature down.
Examples
I'm a little frustrated that this keeps happening.
Honestly, I'm a little frustrated with how long this is taking.
In a conversation
A: Sorry, your parcel still hasn't arrived.
B: OK. I'm a little frustrated, because this is the third time I've come in.
Common mistake
Not: I'm very angry with you.
Say: I'm a little frustrated.
"Angry" is a big word in English. Most people save it for real fights.
