not practical; not workable or not given to practical matters; "refloating the ship proved impractical because of the expense"; "he is intelligent but too impractical for commercial work"; "an impractical solution"
not similar; "a group of very dissimilar people"; "a pump not dissimilar to those once found on every farm"; "their understanding of the world is not so dissimilar from our own"; "took different (or dissimilar) approaches to the problem"
not suited to your comfort, purpose or needs; "it is inconvenient not to have a telephone in the kitchen"; "the back hall is an inconvenient place for the telephone"
not conveniently timed; "an early departure is inconvenient for us"