1. requiring or involving considerable effort; demanding hard work or exertion

Examples

• Learning a new language is an effortful process that requires daily practice.
• The effortful climb up the mountain left everyone exhausted.
• Writing a dissertation is an effortful undertaking that takes months of research.
• She made an effortful attempt to smile despite her sadness.
• The effortful negotiations between the two countries finally resulted in an agreement.
• Paying attention in a boring lecture requires effortful concentration.