"Bastante" can be a word that is used to mean 'very', 'rather', '(adjective) enough', 'too (adjective)', or 'a good amount of'. I'll try with examples:

Le hechaste mucha azucar al cafe, ha quedado bastante dulce.

You put too much sugar in the coffee, it is very sweet.

Cuantos vasos llevo a la mesa? 4 vasos es bastante.

How many glasses should I carry to the table? 4 is good enough.