Tamil is considered to have the most complex grammar among the South Indian languages due to its rich morphology, extensive use of case markers, and complex verb conjugation system.

Karakam is the term used for the grammatical case markers in Tamil. There are eight cases in Tamil, each with its own unique set of rules and usage.

There are 18 verb conjugations in Tamil, each with its own unique set of rules and usage. These conjugations are used to indicate tense, mood, aspect, and person.

The term used for the complex verb conjugation system in Tamil is Tense-Mood-Aspect-Person (TMAP). This system is used to indicate the time, mood, aspect, and person of a verb.

Telugu is known for its extensive use of honorifics, which are used to show respect to elders, superiors, and guests. These honorifics are used in both speech and writing.

The term used for the honorifics in Telugu is 'Garu'. It is added to the end of a person's name or title to show respect.

Kannada is known for its unique script, which is derived from the ancient Brahmi script. The Kannada script is characterized by its round and curved letters.

The term used for the unique script of Kannada is 'Kannada Lipi'. It is one of the oldest scripts in India and is still widely used today.

Malayalam is known for its rich oral tradition, which includes a wide variety of folk tales, songs, and poems. These oral traditions have been passed down from generation to generation and are an important part of Malayalam culture.

The term used for the folk tales in Malayalam is 'Lokakathakal'. These tales are often based on real-life events or legends and are passed down from generation to generation.

Tulu is known for its unique whistling language, which is called 'Kudiya'. This language is used by the Tulu people to communicate over long distances, especially in hilly areas.

The term used for the whistling language in Tulu is 'Kudiya'. It is a unique form of communication that is used by the Tulu people to communicate over long distances.

Konkani is known for its rich vocabulary, which includes a wide variety of words from different languages, including Sanskrit, Marathi, Portuguese, and Kannada.

The term used for the rich vocabulary in Konkani is 'Bhasha Sampada'. It refers to the wide variety of words and expressions that are used in the language.

Kodava is known for its unique script, which is called 'Kodava Lipi'. It is also known for its rich literature, which includes a wide variety of folk tales, songs, and poems.