पर्याप्त  =  enough
The research can not be completed without adquated funding. / an adequate supply of hot water / whenever you go on a journey take adequate water and food.

काफी  =  enough
The room was small but adequate./the space available is not adequate for our needs.

समुचित  =  passable
Her performance was adequate but lacked originality.

योग्य  =  person
She was adequate for the job.

पर्याप्त  =  task
Her training was adequate.