ausgiebig
extensive
Comprehensive, long-lasting, and intensive; to a great extent.
Nach der Wanderung haben wir ein ausgiebiges Abendessen genossen.
After the hike, we enjoyed an extensive dinner.

extensive
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extensive
Comprehensive, long-lasting, and intensive; to a great extent.
Nach der Wanderung haben wir ein ausgiebiges Abendessen genossen.
After the hike, we enjoyed an extensive dinner.

The adjective 'ausgiebig' (extensive) is related to the verb 'ausgießen' (to pour out). It describes something that is so plentiful, as if it had been generously 'ausgegossen' (poured out) — that is, on a large scale or of long duration.
Wir nahmen uns Zeit für ein ausgiebiges Gespräch.
We took time for an extensive conversation.
'Ausgiebig' (extensive) is often combined with activities or meals that take a lot of time. Typical collocations are: 'ein ausgiebiges Frühstück' (an extensive breakfast), 'ein ausgiebiger Spaziergang' (a long walk), or 'eine ausgiebige Diskussion' (an extensive discussion).
Am Sonntag machen wir immer einen ausgiebigen Spaziergang im Wald.
On Sundays, we always take a long walk in the forest.
'Ausgiebig' (extensively) can also be used as an adverb to describe a verb. It then means 'intensiv' (intensively) or 'für lange Zeit' (for a long time), and in this form it is not declined.
Die beiden haben sich ausgiebig über ihre Zukunft unterhalten.
The two of them talked extensively about their future.
short / brief
'kurz' and 'ausgiebig' can be opposites when talking about time or scope. In this case, 'kurz' means that something lasts only a short time or remains brief. 'ausgiebig' means that you take a lot of time and do something thoroughly or for a long time. A brief conversation is over quickly. An 'ausgiebiges Gespräch' (extended conversation) lasts longer and goes into more detail. 'ausgiebig' fits especially well with activities such as eating, sleeping, speaking, celebrating, or practicing.

Am Wochenende frühstückt Frau Wagner gern ausgiebig mit ihrer Familie.
On weekends, Ms. Wagner likes to have a long, leisurely breakfast with her family.
Wir machen nur eine kurze Pause und arbeiten dann weiter.
We’re only taking a brief break and then we’ll keep working.