backIn backInOut backOut bounceIn bounceInOut bounceOut byName circularIn circularInOut circularOut cubicIn cubicInOut cubicOut def elasticIn elasticInOut elasticOut exponentialIn exponentialInOut exponentialOut linear quadraticIn quadraticInOut quadraticOut quarticIn quarticInOut quarticOut quinticIn quinticInOut quinticOut sinusoidalIn sinusoidalInOut sinusoidalOut stepped

quinticOut detail::quinticOutEasing quinticOut {} inlineconstexpr Quintic polynomial easing (t⁵) with very strong deceleration. The quinticOut easing function provides the strongest polynomial deceleration, creating smooth but dramatic slowdown. Popular for animations with long durations (500ms+) requiring strong deceleration. Characteristics: Very strong deceleration Long, smooth tail Very strong deceleration with extended slowdown phase Strongest polynomial option This easing excels at: Applications prioritizing strong visual emphasis: Galleries, portfolios, marketing sites Animations with extended durations: Requiring maximum polynomial deceleration Longer animations: 500ms+ durations Emphasized arrivals: Strong focus on end state QuinticOut provides the strongest polynomial deceleration while maintaining a smooth, continuous curve. Mathematically: f(t) = 1 - (1-t)⁵ // Premium modal entrance auto opacity = tweeny::from(0.0f) .to(1.0f) .via(easing::quinticOut) .during(45U) .build(); See also quinticIn For very strong acceleration quinticInOut For very strong motion at both ends quarticOut For slightly gentler deceleration exponentialOut For even more extreme deceleration Visualize at https://easings.net/#easeOutQuint