You may have seen the word “seldomly”. It looks like an adverb. However, the word is an error, and a common error by many mortals, especially the Americans.
The adverb is “seldom” (rara vez) and “seldomly” is an error and has no place in good writing.
“Seldom” means not often or rarely (raramente).
Contemplate these examples:
- Mr. Sanchez, the Spanish Prime Minister, seldom goes to the opera. Here “seldom” gives more information about “goes”.
- Mr. Morales seldom drives his Rolls Royce.
- Gilberto is seldom seen drinking champagne.
If a mortal uses “seldomly” he will be understood, but it is an error.