Literally: surplus/extra – abundant – lenient/loose – [doubling mark]
Alternately: Calm; unhurried; unphased.
Notes: The symbol 々 is not in and of itself a kanji. Rather, it indicates that the previous kanji is used a second time – an especially valuable shortcut back when everything was written out by hand or carved into a wood block for printing. Naturally, writing 綽綽 is perfectly acceptable.