Millennials don't think much of themselves, report says.

Even millennials don't think much of their generation, according to a new poll Thursday.

A Pew Research Center study showed that millennials – generally defined as those ages 18-34 – had far more negative views of their generation compared to Generation Xers, baby boomers or other age groups. More than half of millennials, 59 percent, described their generation as "self-absorbed," while almost half – or 49 percent – said they were "wasteful," and 43 percent said they were "greedy."

Around 30 percent of Generation Xers – those ages 35-50 – said their own generation was self-absorbed and wasteful, and 20 percent of the baby boomers said the same about their age cohort.

Millennials "stand out in their willingness to ascribe negative stereotypes to their own generation," the study said.

The older the group, the more positively they saw themselves, the Pew study found.

For example, the so-called "Silent Generation" – those ages 70-87 – overwhelmingly described themselves as hard-working, responsible and patriotic, at 83 percent, 78 percent and 73 percent respectively. The baby boomers were not far behind, picking those same three words to describe themselves, at 77 percent, 66 percent and 52 percent, respectively.

But the millennials and Gen Xers were not quite so positive about themselves: only 12 percent of the millennials and 26 percent of Generation X say they are patriotic; 24 percent of the millennials and 43 percent of the Gen Xers say they're responsible; and 36 percent of the millennials and 54 percent of Generation X say they are hard-working.

In fact, the highest-ranking positive traits the millennials came up with for themselves were "environmentally conscious" at 40 percent and "idealistic" at 39 percent.

Many millennials don't even want to be identified as such, with 60 percent not considering themselves to be part of the "millennial generation."

Instead, 33 percent say they are part of Generation X.

The "Silent Generation" also didn't want to identify with its generation. Like the millennials, only 18 percent of the Silent Generation considered themselves part of that group. Instead, more identified as being with the baby boomers at 34 percent or the older demographic "Greatest Generation" at 34 percent.

Generational identity was strongest among the baby boomers, with 79 percent of those within the applicable age group identifying with the "baby-boom" generation.

The poll was conducted using Pew's American Trends Panel among 3,147 respondents, initially selected over the phone but mostly interviewed online.

The margin of error is plus or minus 2.4 percentage points.