Synonyms of the word

unfitting

• adj. That is not fitting for its purpose.
• adj. Improper.

inappropriate

• adj. Not appropriate; not suitable for the situation, time, or place.

incompatible

• adj. Of two things: that cannot coexist; not congruous because of differences; irreconcilable; disagreeing.
• adj. (chemistry) Incapable of being together without mutual reaction or decomposition, as certain medicines.
• n. (medicine, chemistry, chiefly in the plural) An incompatible substance; one of a group of things that…
• n. (philosophy) A consequent of a contrary.

incongruous

• adj. Not similar or congruent; not matching or fitting in.
• adj. (mathematics) Of two numbers, with respect to a third, such that their difference can not be divided by…