forthwith

• "[64] He left the town forthwith, and with all "possible expeditioun passed to the west-land. —  The Scottish Reformation Its Epochs, Episodes, Leaders, and Distinctive Characteristics
• This was done forthwith, and with further aid from the Sanitary Commission, as the Medical Bureau had not yet made any arrangement for brigade hospitals, Miss Bradley assisted by the zealous detailed nurses from the brigade soon gave these two houses a decided "home" appearance. —  Woman's Work in the Civil War A Record of Heroism, Patriotism, and Patience
• The entire population began to burn lime forthwith, and would have gone on burning lime enough to have built a South Sea pyramid equal to Cheops, if they had not been checked and their blazing energies turned into stone-hewing and dressing, and other channels Thus the work went on merrily, and so engrossed were they with it that they did not at first observe the arrival of the visitors. —  The Madman and the Pirate
• They had packed and started forthwith, and returned by the usual route Did my father seem quite himself, just as usual in every way, Buck?" —  Jack Haydon's Quest
• He would heave her overboard forthwith, and trouble his head no more about her. —  Jeff Benson, or the Young Coastguardsman

Roget's II: The New Thesaurus

Allen's Synonyms and Antonyms