English term
Canada
Flawless Translations
Native in: English 
, French
Works in: French to English, English to French
Effortless/Effortlessly
It's for a book and the term needs to remain consistent throughout the book...
PRO (1): Beatriz Ramírez de Haro
When entering new questions, KudoZ askers are given an opportunity* to classify the difficulty of their questions as 'easy' or 'pro'. If you feel a question marked 'easy' should actually be marked 'pro', and if you have earned more than 20 KudoZ points, you can click the "Vote PRO" button to recommend that change.
How to tell the difference between "easy" and "pro" questions:
An easy question is one that any bilingual person would be able to answer correctly. (Or in the case of monolingual questions, an easy question is one that any native speaker of the language would be able to answer correctly.)
A pro question is anything else... in other words, any question that requires knowledge or skills that are specialized (even slightly).
Another way to think of the difficulty levels is this: an easy question is one that deals with everyday conversation. A pro question is anything else.
When deciding between easy and pro, err on the side of pro. Most questions will be pro.
* Note: non-member askers are not given the option of entering 'pro' questions; the only way for their questions to be classified as 'pro' is for a ProZ.com member or members to re-classify it.
Proposed translations
France
Editorial & creative translator IT/FR
Native in: French (Variant: Standard-France) , Italian (Variant: Standard-Italy)
Works in: Italian to French, French to Italian, French, and 1 more.
aisé/aisance -- dépourvu d'effort/absence d'effort (apparent)
en fonction de l’aisance (absence d'effort apparent) avec laquelle nous le faisons
combien aisé (dépourvu d'effort apparent) est...
France
ACSERV SAS - Les Ingénieurs du Verbe®
Native in: French 
Works in: English to French, Spanish to French
'sans effort' ou 'sans peine'
'Sans peine' me paraît plus général et peut-être plus approprié dès lors que le même terme doit être utilisé tout au long de l'ouvrage.
Peine est synonyme d'effort, par exemple dans l'expression 'être à la peine', mais également de tristesse, par exemple 'être en peine' ou 'avoir de la peine'. Ce terme me paraît donc plus générique et plus polysémique.
(mais) combien ça nous coûte
United States
Master's Degree in Linguistics Applied
Native in: French
Works in: English to French, French to English, English to Spanish, and 2 more.
combien aisé
''Effortlessly'' a bien son sens ''sans peine''
Something went wrong...