FREQUENT!
The word that means dry mud is "clay." Clay is a naturally occurring material composed of fine particles that is often found in a dry and hardened state.
Consecutive.
enneatical
It is biennial.
It is biennial.
metabolic
Contralateral
annual or anniversary
The word often means occurring frequently, so it can be used (like frequently) to modify a verb. It can also modify adjectives if they can be variable in occurrence. Examples: We often go to the movies on Friday. The gorillas can often be dangerous. The trip there is often hazardous.
Triennial, from Latin "triennium".
The word "upcoming" is somewhat self explanatory. Upcoming means coming up, forthcoming, about to take place, or occurring soon. It is often used to describe events that are going to take place in the future.
Rarely is an adverb to describe the verb as occurring not very often or seldom.