Similar words
kaschiert
Close synonyms for something kept secret; heimlich is the everyday adverb/adjective for "secretly," kaschiert is more formal, "concealed/disguised."
Similar in other languages
English
clandestine
clandestine is the English word for the same thing — both mean "secret."
English
secluded
Close — secret relates to secluded.
English
covert
Close — covert relates to secret (heimlich).
Practice
1 What does heimlich mean?
secret, secretly
2 Fill the gap: Er hat ___ ein Geschenk gekauft.
Full sentence: Er hat heimlich ein Geschenk gekauft. (He secretly bought a present.)
3 Which fingerprint chart matches heimlich?
heimlich: neutral register, common frequency, general domain, neutral connotation.