Action that seem extremely foolish are ridiculous. The missing letters are r, i and u. Ridiculous is an adjective with 4 syllables
What do you mean by ridiculous?
When something is regarded ridiculous, it must be extremely out of place or inferior. This may be done accidentally or on purpose to draw attention or elicit laughter.
"Ridiculousness" is frequently used interchangeably with the words absurdity and nonsense. From a historical and technical perspective, "absurdity" and "nonsense" are related to logic and reasoning, whereas "ridiculous" is more closely related to laughing, superiority, deformity, and incongruity.
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