Definite

adj.capable, calmprofessional

What it means

Clear, certain, and not open to meaningful doubt or ambiguity.

Reach for it when describing a conclusion, answer, or sign that is firmly established

The inspection found definite evidence that the repair was holding.

everyday
certain
when confidence that something is true is the main point
not when Certain can describe belief even when the evidence is not definite.
everyday
clear
when something is easy to understand or perceive
not when Clarity may concern presentation rather than the underlying fact.
everyday
fixed
when a date, quantity, or boundary will not change
not when Fixed emphasizes stability, not freedom from ambiguity.
professional
conclusive
when evidence settles a question or dispute
not when Conclusive settles the matter too emphatically for a definite plan that could still be revised.
professional
explicit
when meaning is stated directly rather than implied
not when An explicit claim may still be false or uncertain.
professional
specific
when exact details replace a general statement
not when Specific information can remain tentative.
formal
unmistakable
when a sign is so distinctive that confusion is unlikely
not when Unmistakable can overstate ordinary but sufficient evidence.

definite answer
The laboratory promised a definite answer after the second test.
definite plan
We have a definite plan for keeping the library open during repairs.
definite improvement
The revised route produced a definite improvement in journey times.
nothing definite
Nothing definite emerged until surveyors checked the foundations.

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