un·be·liev·ing 
(ŭn′bĭ-lēvĭng)
(ŭn′bĭ-lēvĭng)adj.
Not believing; doubting.
- instruct
- instruction
- instructional
- instructive
- instructively
- instructiveness
- instructor
- instructorship
- instrument
- instrumental
- instrumentalism
- instrumentalist
- instrumentality
- instrumentally
- instrumentation
- instrument flying
- instrument landing
- instrument panel
- insubordinate
- insubordinately
- insubordination
- insubstantial
- insubstantiality
- insufferable
- insufferably