1. Of depth; not capable of being sounded or measured 
2. Resembling an abyss in depth; so deep as to be unmeasurable
   - abysmal, abyssal 
3. Impossible to come to understand

See also: deep, incomprehensible, uncomprehensible, unsoundable

Antonym: fathomable

• winter crookneck
• winter crookneck squash
• winter currant
• winter fern
• winter flounder
• winter flowering cherry
• winter hazel
• winter heath
• winter heliotrope
• winter jasmine
• winter melon
• winter melon vine
• winter mushroom
• Winter Olympic Games
• Winter Olympics
• winter purslane
• winter rose
• winter savory
• winter savoury
• winter solstice
• winter squash
• winter squash plant
• winter sweet
• winter urn
• winter vomiting virus