The word isn't is a contraction, a shortened version of 'is not'.
The verb 'is' is a being verb, not an action verb; the word 'not' is an adverb to modify the verb. Example:
John is not in this movie. OR, John isn't in this movie.
no it isnt
no,it isnt but in your world yes,it is a real word and you can make up a meaning for that particular word but in our world it isnt real im sad to say
It isnt a hindi word.
wus isnt an English word. do you mean was? if you do, then the conjugation will depend on which past tense it is used in in the sentence (preterite, imperfect, etc). Also, it will depend on who was doing the action (yo, ella, el).
there isnt one
There isnt
it isnt even a word.
it isnt, wasnt and probably never will be
no it isnt its 2
There isnt one, sorry!
abadeed isnt a word
It isnt