adj. Lacking a distinct meaning; having no certain signification.
the GNU version of the Collaborative International Dictionary of English
adj. Wanting a distinct meaning; having no certain signification.
The Century Dictionary and Cyclopedia
Wanting a distinct sense or meaning; without a certain signification.
Word Usage
""Since you are now used to the overbearing smell, see if you can now distinguish other, previously unsensed odors, while you're out and about today.""