anticlimactic

Words with a similar base: anticlimactic, anticlimactical

'anticlimactic'

[anticlimactic.a.01] as in: of or relating to a sudden change from an impressive to a ludicrous style

'anticlimactic'

[anticlimactic.a.02] as in: coming after the climax especially of a dramatic or narrative plot

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Examples:
everything after the discovery of the murderer was anticlimactic