Reliable

adj.capable, calmprofessional

What it means

Consistently worthy of trust to perform or report as expected.

Reach for it when praising a person, source, method, or device that can be counted on

Mei is reliable enough to hold the keys and open the center every Saturday.

warm
dependable
when a person's steady follow-through is the main praise
not when For measurements or evidence, dependable is less exact than reliable.
warm
trustworthy
when honesty and care with confidence are central
not when Someone may be trustworthy yet unable to deliver consistently because of limited capacity.
professional
accurate
when closeness to the truth or correct value is what matters
not when A single accurate reading does not prove repeated reliability.
professional
consistent
when results vary very little over time
not when Consistency can preserve a poor standard, while reliable implies acceptable performance.
professional
punctual
when arriving or delivering on time is the precise strength
not when It is too narrow if the person also deserves credit for accuracy and follow-through.
professional
responsible
when careful ownership of duties matters
not when Responsibility concerns conduct and judgment, not whether performance repeats consistently.
formal
proven
when a track record has already demonstrated success
not when New equipment can be reliable by design before it has earned the history implied by proven.
formal
sound
when evidence, construction, or reasoning is solid enough to trust
not when Sound is a broad judgment and may not promise repeatable results.

reliable colleague
A reliable colleague, Dev returned every handover note before noon.
reliable source
The reporter waited for a reliable source before naming the supplier.
reliable service
Backup batteries kept the radio service reliable through the storm.

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