The word “unclear” is a reasonable interpretation for the meaning “unclear”. You might consider “opaque” if you want to communicate not only that it’s unclear to you, but that it’s generally unclear, or you could use “uncertain” if it’s strictly unknown how the algorithm will behave.

You cannot use any word or example in your sentences to justify your purpose in explaining the subject or paragraph, which appears to be more like a verb rather than a word or phrase. “The search behaviour of the algorithm is not clear to us” is fine, but you could also consider something like “We don’t know what the search behaviour of this algorithm is”, or “It is not clear to me how this search algorithm will behave” can be fine.

If you are particularly interested in certain aspects of the behaviour of the algorithm, i.e.. f=f5, f=f, (f, ) andf=f=f=f,.(f, , f=f), please see. performance, optimality, or stability, you might be better to highlight the particular area that is unclear.

The word “unclear” is a reasonable interpretation for the meaning “unclear”. You might consider “opaque” if you want to communicate not only that it’s unclear to you, but that it’s generally unclear, or you could use “uncertain” if it’s strictly unknown how the algorithm will behave.

You cannot use any word or example in your sentences to justify your purpose in explaining the subject or paragraph, which appears to be more like a verb rather than a word or phrase. “The search behaviour of the algorithm is not clear to us” is fine, but you could also consider something like “We don’t know what the search behaviour of this algorithm is”, or “It is not clear to me how this search algorithm will behave” can be fine.

If you are particularly interested in certain aspects of the behaviour of the algorithm, i.e.. f=f5, f=f, (f, ) andf=f=f=f,.(f, , f=f), please see. performance, optimality, or stability, you might be better to highlight the particular area that is unclear.

On the other hand, “I nailed her last night” and “I screwed her last night” would be taken as having the same meaning.

I’d also note that screwed has yet another meaning, if you screw up a bit of paper then you are crumpling it in a ball as you might do on discovering you messed it up. Why did you screw it up in a sentence? The term a hit the nail really came from hitting the nail on the head, as noted by Janus.

Do similar concepts and expressions have different meanings?