IPA: /ˌɛkspɪˈdɪʃəs/
KK: /ɛkˈspɛdɪʃəs/
Done quickly and efficiently without wasting time.
The team completed the project in an expeditious manner, impressing the client.
Expeditious → It is formed from "ex-" (meaning out) and "pedis" (from Latin "pes", meaning foot). The word describes something that is done quickly or efficiently, as if one is moving swiftly on foot.
Think of 'moving out' ('ex-') quickly on 'foot' ('pedis') — that's why expeditious means done quickly.