instructive

Instructive means "useful and informative." Say you're visiting Paris and looking for the Eiffel Tower when a friendly Parisian native helpfully stops to draw you a map. "Merci," you say. "This map is very instructive."

In English, anything that informs or enlightens is instructive, but in the Finnish language there's something called the instructive case, which is a whole separate way of saying "by the means of." An example would be a sentence like "I traveled here by horse," which you would say differently than any other kind of sentence you might utter. You would also be speaking Finnish, so the information would only be instructive to Finns.

Definitions of instructive
1

adj serving to instruct or enlighten or inform

Synonyms:
informative
informative, informatory
providing or conveying information
clarifying, elucidative
that makes clear
demonstrative, illustrative
serving to demonstrate
didactic, didactical
instructive (especially excessively)
doctrinaire
stubbornly insistent on theory without regard for practicality or suitability
educative
resulting in education
educational
providing knowledge
explanatory
serving or intended to explain or make clear
expositive, expository
serving to expound or set forth
interpretative, interpretive
that provides interpretation
ostensive
manifestly demonstrative
preachy
inclined to or marked by tedious moralization
Antonyms:
uninstructive
failing to instruct

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