Used chiefly as an uncountable noun meaning clumsy or inept behaviour.
Definitions
Clumsy or inept behaviour; bungling. Their constant bumbling cost the team the victory.
bumblegerund / present participle Used of the present participle 'bumbling' functioning as an adjective (e.g., 'a bumbling detective').
Definitions
Characterized by clumsy or inept action; prone to making mistakes. The bumbling burglar left fingerprints everywhere.