Adverbs
Adverbs are uninflected words that describe how some action was done:
गजो मन्दं चरति
gajo mandaṃ carati
The elephant walks slowly.
We can change any adjective into an adverb by using it in its neuter case 1 singular form:
मृदु → स मृदु भाषते।
mṛdu → sa mṛdu bhāṣate.
soft → He speaks softly.