Unfortunately

[poli]

Unfortunately I will not be able to attend the conference today.
Desafortunadamente (o desgraciadamente) no puedo asistir la conferencia hoy.

No siento cómodo usar la palabra desgraciadamente. ¿Se la puede
usar en este sentido? Su cognado en inglés disgraciously/disgrace conota
algo de vergüenza.

[Perikles]

I don't know whether this might help:

unfortunatelyadverb

1 (unluckily, regrettably) (independent) lamentablemente, desafortunadamente; (stronger) desgraciadamente, por desgracia


2 (inappropriately): it was unfortunately worded estaba expresado de una manera desacertada or desafortunada

[aleCcowaN]

"Desafortunadamente" está bien en esa frase.

If you use "desgraciadamente" or "por desgracia" it looks it is sort of a tragedy not being able to be there. Of course, it'd be taken as a formalized and demure way to say "Oh, darn! I hate I can't be there, man!", so it's sort of a free pass to get emotional about 0.8 in Richter's scale.

"Desafortunadamente no podré asistir hoy a la conferencia." (or "a la conferencia de hoy", especially when there are more than one scheduled) it's a pretty neutral way to say it which still communicates genuine discomfort for not being able to attend.

[chileno]

Originally Posted by poli

Unfortunately I will not be able to attend the conference today.
Desafortunadamente (o desgraciadamente) no puedo asistir la conferencia hoy.

No me siento cómodo usar la palabra desgraciadamente. ¿Se la puede
usar en este sentido? Su cognado en inglés disgraciously/disgrace conota
algo de vergüenza.

Originally Posted by Perikles

I don't know whether this might help:

unfortunatelyadverb

1 (unluckily, regrettably) (independent) lamentablemente, desafortunadamente; (stronger) desgraciadamente, por desgracia


2 (inappropriately): it was unfortunately worded estaba/estuvo expresado de una manera desacertada or desafortunada

Just a correction and an addition.

[poli]

Thanks all for the info and correction. Lamentablemente sounds like a
more graceful word than desafortunadadamente. Now I know that
una degracia is a truly serious misfortune.

[irmamar]

I would use "lamentablemente" (although "desgraciadamente" is also correct).

[Luna Azul]

Infortunadamente, desafortunadamente, lamentablemente, desgraciadamente, desdichadamente.

All are correct. Each of these words are used in the same way.