This is the 139th most frequent Estonian word.
kuigi
"Kuigi" means "although" or "even though" in English.
'Kuigi' here sets up the context of the sentence, indicating a contrast between being busy and finding time.
Kuigi ta on hõivatud, leidsime aja kohtumiseks.
Although he is busy, we found time to meet.
Here, 'kuigi' introduces a concession or contrast between the cold weather and the decision to go hiking.
Kuigi ilm on külm, läheme ikka matkama.
Even though the weather is cold, we are going hiking.
The word 'kuigi' is used to present a contrast between the speaker's belief and others' doubts.