Eavesdropping.
spying
Conference, convention
Ear
The word pine can have that meaning.
As in easy mac, easy listening, easy buttons...ect
The act of secretly listening/watching/surveying someone is called 'surveillance'. If you are listening in on a private conversation, it could be said that you are keeping a surveillance over them. However, there is another word for listening in on a conversation you are not a part of - and that is eavesdropping. It means to hang nearby and listen in without them being aware of you presence.
spying
It comes from the Latin clandestinus clam meaning 'secretly.'
Secretly is an adverb.
The word for looking at someone or something secretly is "spying" or "peeking".
Controlled (APEX) :):):):):):):):):)
"Listening" is not an adverb; it is a present participle form of the verb "listen." Adverbs typically modify verbs, adjectives, or other adverbs, but in this case, "listening" is functioning as a verb or a noun in a sentence.
The word you are looking for is "conspire". It means to plan something secretly with others.
The word "listening" can be divided into syllables as: lis-ten-ing.
infatuated?
Covertly
From Latin 'connivere' meaning 'to blink or to wink' at a crime. Passed into French as 'conniver' which became to mean secretly plotting together