adverb
as much as one likes; any amount; plenty
Expresses that there is no limit on quantity or degree; can be used with both countable and uncountable things. Often implies abundance or willingness to provide.
お菓子はいくらでもあるから、遠慮しないで食べてね。
There are as many snacks as you like, so don't hold back and eat up.
He said he would lend me any amount of money.
adverb
almost none; hardly any
Used in the negative pattern いくらでもない to mean 'there is hardly any' or 'not much'. This is a fixed expression.
冷蔵庫には食べ物がいくらでもない。
There is hardly any food in the fridge.
adverb
no matter how much; regardless of amount
Used in contexts where the amount or degree does not affect the outcome; similar to 'no matter how much/many'.
いくらでも勉強しても、まだ不安だ。
No matter how much I study, I still feel anxious.