Useful

adj.capableeveryday

What it means

Able to help achieve a purpose or meet a real need.

Reach for it when praising practical value without claiming excellence, beauty, or completeness

The handover was useful because it listed the failed approaches as well as the final fix.

playful
handy
when convenient availability or easy use deserves informal praise
not when For a major tool or formal evaluation, handy sounds too slight.
warm
helpful
when assistance to a person is more important than the object's function
not when Helpful can describe kind intent even when the result has little practical value.
warm
worthwhile
when the benefit justifies the time or effort invested
not when Worthwhile evaluates the overall tradeoff, not direct usefulness for a task.
professional
effective
when evidence shows the thing produces the intended result
not when Effective is a stronger causal claim than merely useful.
professional
functional
when something performs its basic intended operation
not when Basic operation need not make the result useful to this reader.
professional
practical
when suitability to real conditions matters
not when Practical contrasts with theoretical or ornate, while useful simply means it serves a purpose.
professional
valuable
when importance or benefit is substantial
not when Valuable is stronger and may refer to money, rarity, or significance rather than utility.
formal
serviceable
when adequate performance, not distinction, is the honest claim
not when Serviceable implies mediocrity and would undercut enthusiastic praise.

useful information
The guide gives useful information about costs before describing the benefits.
useful tool
A useful tool should make the next decision easier, not add another dashboard.
find useful
New volunteers may find useful the map printed inside the supply cabinet.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.