What is a more decent/formal alternative for the word suck? I want to use it in the context of being bad at something.
To be precise, I want to translate "To suck less at a job every day" to formal English.
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I think you just used it. Any alternative is going to depend on exactly where you are using the phrase. A CV will need a different expression from chatting to your mother.
To suck less is to improve:
You should be more careful because what you're writing is a CV and not just any story.
Basically, what you would like to say is that you suck but you are a "fast-learner."
Like you said, "I suck less at a job every day."
Now, the problem is how to word it because the expression "fast-learner" or "quick-learner" is actually a kind of cliche in CV writing.
You could say:
The last one is actually an example of how you can "show" and not "tell" that you are indeed a fast-learner.