Not fit for a voyage: applied to a ship not in a fit state, as to repairs, equipments, crew, and all respects, to encounter the ordinary perils of a sea voyage.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. unfit for a voyage
Word Usage
"Then, over the past two years, they've sunk a dozen emptied migrant boats they deemed "unseaworthy" - setting them ablaze and firing on them with their .50-caliber guns."