undeterminable
- a not capable of being definitely decided or ascertained
- On Wednesday, he wore a light-brown pinstriped suit, a white shirt and a yellow tie with dots of an undeterminable color.
- The cocktail hour starts at 8:30, and until he sits down to his supper at some undeterminable time after 10 p.
- Whether there was any connection or not between the insidious diplomacy of the Manchurian War Lord and 5,000 Japanese in Tokyo was undeterminable.