Long comparatives (бћлее-comparatives) are somewhat bookish and are avoided in conversational Russian.
To avoid a long comparative in the predicate position, use the short comparative.
To avoid the long comparative in attributive position (i.e. modifying a noun), use the по-comparative: add the prefix по- to a short comparative form:
bookish:	Ї купќл бћлее интерљсную кнќгу.	I bought a more interesting book.
normal:	Ї купќл кнќгу поинтерљснее.	(Same meaning.)
Sometimes the longer form isn't used at all, but the по- comparative is very common:
	Ї хочџ кнќгу побћльше.	I want a larger book.
	Јтот словђрь похџже.	This dictionary is not as good (as the other one).
Мљнее 'less' works like бћлее 'more'. You can avoid it by using не такћй.
bookish:	Јто мљнее интерљсная кнќга.	That's a less interesting book.
normal:	Јто кнќга не такђя интерљсная.	That book isn't so interesting.
Note this common idiomatic expression:
	— ТІ приготћвил домђшнее задђние — Бћлее или мљнее.	"Have you done your homework?" "Yes, more or less."