Not possible; not able to be done or happen.
Very difficult to deal with.
A skateboard trick consisting of a backflip performed in midair.
An impossibility.
Able to be sensed by the senses or the psyche; able to be perceived.
Acting with or showing good sense; able to make good judgements based on reason, or reflecting such ability.
Characterized more by usefulness, practicality, or comfort than by attractiveness, formality, or fashionableness, especially of clothing.