stressful

From stress +‎ -ful.

• enPR: strĕs'fəl, IPA^(key): /ˈstɹɛsfəl/

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stressful (comparative more stressful, superlative most stressful)

1. Irritating; causing stress.
   • 1970, Richard Nelson Bolles, What Color Is Your Parachute?:

     I have always argued that change becomes stressful and overwhelming only when you've lost any sense of the constancy of your life. You need firm ground to stand on. From there, you can deal with that change.

2. (of a task) Mentally taxing.

• stress
• stressed
• stressfully