Previous studies of semantic implicit learning in language have only examined learning grammatical form-meaning connections in which learning could have been supported by prior linguistic knowledge. In this study we target the domain of verb meaning, specifically semantic preferences regarding novel verbs (e.g., the preference for a novel verb to take abstract objects). Using a reaction time methodology we show that, after exposure to correct verb-noun combinations, reaction times to incorrect combinations are slowed down even for participants who are unaware of the semantic regularity. This effect was obtained on a decision that was irrelevant to the actual underlying regularity, suggesting that the knowledge that has been acquired exerts its influence automatically, hence satisfying one criterion for implicitness. Combined with a lack of verbalizable knowledge, these experiments provide strong evidence for semantic implicit learning in language.