without doubt or question
"they were clearly lost"
"history has clearly shown the folly of that policy"
in an intelligible manner
"the foreigner spoke to us quite intelligibly"
clear to the mind; with distinct mental discernment
"it's distinctly possible"
"I could clearly see myself in his situation"
In a clear manner.
"Please explain your instructions more clearly so I don't have to ask you for clarification again."
In plain English: Clearly means something is very obvious and easy to see or understand without any doubt.
"You can clearly see the mountains from here."
Usage: Use clearly to describe actions performed with obviousness or distinctness, such as speaking so that others can hear easily. Avoid using it to mean "very" or "extremely," which is a common error in informal speech.
The word clearly comes from the Middle English phrase meaning "in a clear manner." It entered modern usage by simply adding the suffix "-ly" to the existing adjective clear.