The Collaborative International Dictionary of English v.0.48:
Reefy \Reef"y\ (r[=e]f"[y^]), a. Full of reefs or rocks. [1913 Webster]WordNet (r) 3.0 (2006):
reefy adj 1: full of submerged reefs or sandbanks or shoals; "reefy shallows"; "shoaly waters" [syn: reefy, shelfy, shelvy, shoaly]