amateurish

People who understand the process of diplomacy think that this is very amateurish and is unlikely to yield real results that are enforceable.

The ubiquitous ads for the L.A.-based clothing company featured gritty, amateurish photos of seemingly ordinary young women, posed suggestively, in various states of undress.

Structural conditions, cultural conditions, and our policy record don’t account for our failure; the Democrats’ amateurish messaging does.

Others predicted that Trump’s rallies in blue states would be failures that reflect the nature of Trump's impulsive and amateurish campaign.

The way England batted to be 156 all out in only 34 overs in their second innings was amateurish.