1. Having no border

Antonym: bordered

• thimble-shaped
• thimbleberry
• thimbleful
• thimblerig
• thimblerigger
• thimbleweed
• thimerosal
• thin
• thin air
• thin out
• thin person
• thin-bodied
• thin-leaved bilberry
• thin-leaved stringybark
• thin-shelled
• thin-shelled mussel
• thin-skinned
• thine
• thing
• thing-in-itself
• thingamabob
• thingamajig
• thingmabob
• thingmajig
• thingo