Plotted, conspired.
The word you are looking for is "conspire". It means to plan something secretly with others.
Peep.
secretly talk
If by secretly you meant cautiously then walking stealthily or tip toeing .
contractconspiracy
eavesdropping
infiltrate
Planned
There is no such word. The word secrete is a verb (to release fluid) and secret means hidden or private. The word secretly is an adverb (in a secret or covert manner).
it is an adjective that means done secretly; During my clandestine visits
surreptitious broken down into its word parts: sub- or its variant (in this case)sur- means "less than normal, under, below, secretly" + -rap- which means "to seize" (other words containing the same word part are rape, ravish, rapture, rapacious, raving) + -ious which means "full of, tendency to, characteristic of" so literally surreptitious means "secretly seizing characteristic".A mnemonic acronym to recall the meanings for sub- is you're secretly SUBLeTtiNg (secretly, under, below, less than normal) a sub to an unsuspecting diplomatic tenant.
uni word means to sing together as one