Ilguaskas

look at that- absolutely no definition on those arms and deltoids, even when those muscles are flexed
paul pierce

when i pierce was at kansas, i always wondered why he would sport the t-shirt under the jersey. now i know why. pierce probably has the weirdest nba body in the league. he's sorta like ruth riley formerly of notre dame- bottom heavy. to his credit, he does look more cut this season
anotine walker

that little extra weight walker carries i thought was baby fat. but he still looks the same since his rookie year. he has a thick body but his muscles don't look it
reggie miller

much respect to one of the league's all time best clutch shooter, but this dude is skinny. nba.com lists him at 195lbs- yeh maybe with10 wet sweaters on. miller time gets special recognition for being on the nba's all ugly team as well.
marcus camby

it's not a surprise camby is known as mr glass. camby's reckless/energetic style of play makes him especially vulnerable with that thin frame
honorable mention:
shawn bradley
allen iverson
robert traylor
andrei kirilenko
tony delk