IPA: /ˈstrɛs.fəl/
KK: /ˈstrɛs.fəl/
Causing feelings of worry or pressure, often due to difficult situations or demands.
Preparing for exams can be very stressful for students.
Comparative: more stressful
Superlative: most stressful
Stressful → It is formed from "stress" (from Old French *estresse*, meaning narrowness or oppression) and "-ful" (meaning full of). The word "stressful" means full of stress or causing stress.
Think of the word 'stress' which comes from a term meaning oppression, and remember that 'stressful' describes something that is full of that pressure.