"promptest" in the adjective sense
1. prompt
according to schedule or without delay on time
"the train is prompt"
2. prompt
ready and willing or quick to act
"she is always prompt to help her friends"
3. immediate, prompt, quick, straightaway
performed with little or no delay
"an immediate reply to my letter"
"a prompt reply"
"was quick to respond"
"a straightaway denial"
Source: WordNet® (An amazing lexical database of English)
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