say it: FLUH-stur
fluster is a verb and noun meaning "be flustered; behave in a confused manner". It carries 3 recorded senses.
be flustered; behave in a confused manner
a disposition that is confused or nervous and upset
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for fluster come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.