adjective, sea·wor·thi·er, sea·wor·thi·est. (of a vessel)
- constructed, outfitted, manned, and in all respects fitted for a voyage at sea.
- safe for a voyage at sea.
- in a fit condition or ready for a sea voyage
adj.1807, “in fit condition to encounter heavy weather at sea,” from sea + worthy. Related: Seaworthiness. Old English had særof “hardy at sea.”