1. comparative form of sly; more cunning, crafty, or deceitful

Examples

• He became slier with each passing year, learning to manipulate situations to his advantage.
• The fox grew slier after being caught in several traps.
• She gave him a slier look than usual, suggesting she knew more than she was letting on.
• The politician’s slier tactics eventually backfired when voters caught on.
• Each scheme was slier than the last, but none succeeded.
• His slier approach to negotiations made his opponents wary.