realistically
In a way that looks at what is actually possible.
Realistically means looking at a situation as it truly is, not as you wish it were or fear it might be. When you think realistically, you consider the actual facts, your real abilities, and what's genuinely possible.
If you're planning to read a 400-page book before tomorrow's book report, thinking realistically means admitting you probably can't finish it in time, no matter how fast you read. A realistic plan might be reading a summary and the first few chapters tonight, then talking to your teacher in the morning about an extension.
Being realistic doesn't mean being pessimistic or giving up on big dreams. A student who wants to make the basketball team can realistically decide that she needs to practice free throws every day for three months, rather than fantasizing that she'll magically improve overnight or worrying that she'll never get better.
Thinking realistically helps people make smart decisions. When your friend suggests building a tree house in an afternoon, you might say, “Realistically, that'll take us at least a weekend.” You're not being negative; you're helping everyone understand what's actually required so you can plan properly and succeed.