clusterful adjective 1noun 1forms 4 adjective1 •Having phonological rules that allow consonant clusters.Sranan, perhaps because it was spoken on the plantations alongside Dutch, a pretty clusterful language, grew more tolerant of clusters and dropped the first epenthetic vowel. — 2008 noun1 •A quantity that forms a cluster.We flew — fur-jacketed moths in the night. Clusterfuls of us on borrowed boards and in temporary clothes. — 2015 formsclusterfuls · clustersful · more clusterful · most clusterful