1. (

• immediately ,
• instantly ,
• straightaway ,
• straight_off ,
• directly ,
• now ,
• right_away ,
• at_once ,
• forthwith ,
• like_a_shot

) without delay or hesitation; with no time intervening; "he answered immediately"; "found an answer straightaway"; "an official accused of dishonesty should be suspended forthwith"; "Come here now!" ;

2. (

• promptly ,
• right_away ,

) at once (usually modifies an undesirable occurrence); "he promptly forgot the address" ;