reichlich
plentiful
Present in a large amount; more than enough.
Auf dem Buffet gab es reichlich zu essen für alle Gäste.
There was plentiful food for all the guests at the buffet.

plentiful / quite
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plentiful
Present in a large amount; more than enough.
Auf dem Buffet gab es reichlich zu essen für alle Gäste.
There was plentiful food for all the guests at the buffet.

'Reichlich' (plentiful / quite) is derived from 'reich' (rich). The ending '-lich' turns the adjective 'reich' (in the sense of 'having a lot') into a word that means 'in a rich/large amount'.
Wir haben noch reichlich Zeit bis der Zug abfährt.
We still have plenty of time before the train departs.
The meaning of 'reichlich' depends on its function in the sentence. If it comes before a noun, it means 'a lot' or 'more than enough'. If it comes before an adjective or adverb, it means 'quite' or 'very'.
Nach der Wanderung hatten wir reichlich Hunger.
After the hike, we were plenty hungry.
In the meaning 'in großer Menge' (in a large amount), 'reichlich' is often used with uncountable nouns or plural nouns. Typical combinations are 'reichlich Zeit' (plenty of time), 'reichlich Platz' (plenty of space), 'reichlich Gründe' (plenty of reasons), or 'reichlich Essen' (plenty of food).
Für den Umzug brauchen wir reichlich Kartons.
We need plenty of boxes for the move.
As an adverb for emphasis, with the meaning 'ziemlich' (quite), 'reichlich' is often used to express slight surprise or criticism. It can sound somewhat more formal or emphatic.
Deine Erklärung ist reichlich kompliziert.
Your explanation is quite complicated.
very
'sehr' and 'reichlich' can both intensify something, but they do not fit equally well in every situation. 'sehr' is the general word for a high degree and works with many adjectives, adverbs, and feelings. 'reichlich' often means that there is a lot of something, or more than enough. As an intensifier, it sounds more like 'quite' or 'more than expected', for example with time, work, or problems. 'sehr' is more neutral, while 'reichlich' often carries a hint of quantity or a slight sense of 'that is a lot'.

Für die Besprechung haben wir noch reichlich Zeit.
We still have plenty of time for the meeting.
Wegen der hohen Rechnung ist sie sehr besorgt.
Because of the high bill, she is very worried.