Posiblemente se refiere a promesas endebles. Ésta es mi sugerencia.

para darle un toque más romántico...

another option...

depending on your target style, maybe also flippant, frivolous, easy, hasty

either captures two senses: light and airy + not to be taken seriously

promises made in the heat of the moment without thinking it through.

--------------------------------------------------
Note added at 1 hr (2006-10-27 22:51:02 GMT)
--------------------------------------------------

meaningless promises

Aunque literalmente seri'a light promises o algo asi', me parece que por el contexto algo como drifting promises o floating promises funciona por lo del viento etc...

Suerte

--------------------------------------------------
Note added at 1 hr (2006-10-27 22:55:45 GMT)
--------------------------------------------------

Fleeting promises might be a good option. I just thought of it.

just whispered to the wind and opposite to a heavy conscience

Tao Teh Ching 63 - Church of the East - [ Traduzca esta página ]Lindauer, In the end light promises seed scanty belief Abundant easiness seeds abundant difficulty. LinYutan, He who lightly makes a promise Will find it ...
wayist.org/ttc%20compared/chap63.htm - 30k

It's all in the degree of course - but wishful thinking, exagerrated emphasis and light promises are all grease to the diplomatic works of leadership, ...
sensibleelection.com/entry.php/3156 - 9k

This is the equivalent English idiom. It's a line found in English song after song.

¡Suerte!

Since I don't think the Spanish version wants to transfer a negative meaning, I've agreed with Flavia; 'light promises' seems very good for this context, and I've added this two more options, that I think could fit in your context. :-)

another option

unfounded promises. A typical ex-. ample is slimming products. Gen-. erally sellers of miracle products. cannot present research findings ...
www.kuluttajavirasto.fi/user/loadFile.asp?id=6117

12] These actions have involved products making allegedly unfounded promises to prevent colds, products allegedly deceptively touted as safe and natural ...
energycommerce.house.gov/108/Hearings/06162004hearing1303/Beales2053.htm

Although I do hope, and firmly suspect, that no investor would seriously consider sponsoring such a collection of unfounded promises. ...
www.sciforums.com/showthread.php?t=46065

Ukrainian MP: Yushchenko feeds the people with unfounded promises
“Position of the World Trade Organization does not reflect the optimistic statement of President Yushchenko claiming that Ukraine would join the WTO this ...
politicom.moldova.org/stiri/eng/5443/

the Mail online
But the health food shops won't tell you that - they're just happy to peddle stuff to you on the basis of unfounded promises and ridiculous claims. ...
chat.dailymail.co.uk/dailymail/threadnonInd.jsp?forum=21&thread=9775304&message=12185262

--------------------------------------------------
Note added at 10 hrs (2006-10-28 08:19:37 GMT)
--------------------------------------------------

or baseless

The Labour Party makes no baseless promises. The future will not be easy. But this time the peace must be won. The Labour Party offers the nation a plan ...
www.psr.keele.ac.uk/area/uk/man/lab45.htm


--------------------------------------------------
Note added at 1 day1 hr (2006-10-28 23:17:15 GMT)
--------------------------------------------------

changed mind a bit - careless promises

Careless promises. Every empty word that's spoken Each heartfelt promise carelessly broken This the stuff of shattered trust ...
poets.unknowncommunity.com/db/poems/28267?pl=none

The plumber who charmed me with his loose talk and careless promises of tomorrow didn’t turn up. Not on Wednesday. Not on Thursday. ...
www.cumberland-news.co.uk/opinion/category.aspx?c=789&t=Sar...

Rash promises do such things: they are careless promises, made without concern for us, ourselves, or for God's creatures who surround us. ...
episcopaldailyofficeannotated.org/11-06-03.htm

... by Author | search by Poem | Register | Login. Title:, Careless promises. Category:, Love. Author:, Sue Q. View Poem | Post comment. Your Name:. Subject:
poets.unknowncommunity.com/db/mb?thread=28267

He left her starry eyed and two minutes pregnant, waving, as the van drove away with careless promises of tomorrow ringing in her ears. ...
www.newsandstar.co.uk/opinion/viewarticle.aspx?id=406597

Rash promises do such things: they are careless promises, made without concern for us, ourselves, or for God's creatures who surround us. ...
episcopaldailyofficeannotated.org/11-06-03.htm

thought I'd put it as a new answer - prefer this one

careless promises

Careless promises. Every empty word that's spoken Each heartfelt promise carelessly broken This the stuff of shattered trust ...
poets.unknowncommunity.com/db/poems/28267?pl=none

The plumber who charmed me with his loose talk and careless promises of tomorrow didn’t turn up. Not on Wednesday. Not on Thursday. ...
www.cumberland-news.co.uk/opinion/category.aspx?c=789&t=Sar...

Rash promises do such things: they are careless promises, made without concern for us, ourselves, or for God's creatures who surround us. ...
episcopaldailyofficeannotated.org/11-06-03.htm

... by Author | search by Poem | Register | Login. Title:, Careless promises. Category:, Love. Author:, Sue Q. View Poem | Post comment. Your Name:. Subject:
poets.unknowncommunity.com/db/mb?thread=28267

He left her starry eyed and two minutes pregnant, waving, as the van drove away with careless promises of tomorrow ringing in her ears. ...
www.newsandstar.co.uk/opinion/viewarticle.aspx?id=406597

Rash promises do such things: they are careless promises, made without concern for us, ourselves, or for God's creatures who surround us. ...
episcopaldailyofficeannotated.org/11-06-03.htm