The word that means to fill with alarm is "frighten." It describes the action of causing someone to feel fear or anxiety. Other synonyms include "dismay" and "alarm" itself, which also convey a sense of sudden fear or concern.
tocsin, I believe
The root word of "alarm" is the Italian word "allarme," which means to give warning or signal of danger.
alarm
Inflate.
joyful
Inflate.
gonfler (to inflate)
Impleo means "I fill" or "I fulfil".
submerge
Confabulate is not a word. However, confabulate is a word that means to informally talk, or to holding a conversation. It also means to fill in gaps when memory fails.
The word entranced means to put into a trance. It also means to fill with delight and excitement. A child would be entranced by a passing parade or carnival.
The alarm was very loud.They said there was no cause for alarm.