"slightly addictive" is a correct and usable phrase in written English.
You can use it to describe something that is not highly addictive, but can still cause you to want to do it more often. For example: "This newly-released game has a slightly addictive quality that keeps you wanting to play it again and again."
The feedback, Mr. Systrom said, can be slightly addictive.
"The grain has a wonderfully smoky, nutty (and slightly addictive) nature," Ottolenghi says.
Snapguide, a beautifully made (and slightly addictive) place to check out bursts of useful/aspirational information, has a lot of potential as a place for brands to market themselves with more active how-to content rather than simple, static ads.
For the holidays, we wanted to come up with a campaign that had some fun competitive juice to it and is even slightly addictive, so we've launched the Crowdrise Holiday Fundraiser Thing (CHFT).
The proprietor, Gary MacGurn, lived for five years on an ashram in India, where he mastered the art of making the slightly chewy, addictive sourdough crêpes called dosai.
Slightly less addictive is the noise it generates, which is like what you'd hear if you were strapped to the deck of an aircraft carrier.
Vicodin, of course, is the prescription painkiller Eminem liked so much he immortalized it on "The Slim Shady LP," and a drug better appreciated in the fashion business for its appetite-suppressing powers than for the truly unappetizing truth that it is only slightly less addictive than heroin.
This kind of voyeurism is perhaps slightly embarrassing, but addictive.
After finessing Massow, Brown then switches into full-on Fagin mode, giving his slightly bumbling squad their first addictive taste of skullduggery by forcing them to steal chips from unsuspecting al fresco diners in Brighton.
It's an intense, addictive broth, each sip slightly different than the one before it.
"Be warned," says the town's ever-so-slightly-eccentric website, "the place is dangerously addictive.
