seldom, seldomly

Because most adverbs end in ly, some people mistakenly add ly to the adverb seldom. However, seldomly is non-standard English and should be avoided.

Instead, use seldom, the correct adverb form:

• Ontarians seldom (not seldomly) have such warm weather in October.

In more formal constructions, the adverb seldom can be used at the beginning of a sentence, with the helping verb before the subject:

• Seldom do we learn from a first mistake.
  [Here, the helping verb do is placed before the subject we.]