The author had a copious amount of research to support his argument.
copious notes
Frequency:
70
%
She took copious notes during the lecture to ensure she didn't miss any important information.
copious supply
Frequency:
60
%
The store had a copious supply of fresh fruits and vegetables.
Idiomatic Expressions for copious
Phrase: copious amounts of time
Meaning: a significant or excessive amount of time
Usage: She spent copious amounts of time working on her art project.