A relaxed mood.
"After hours of yoga and herbal tea, she finally felt mellow enough to listen to her friend's problems without getting annoyed."
make or grow (more) mellow
"These apples need to mellow a bit more"
"The sun mellowed the fruit"
To make mellow; to relax or soften.
"The warm music helped mellow her nerves before the big presentation."
Soft or tender by reason of ripeness; having a tender pulp.
"The bananas were perfectly mellow, so their soft pulp made for an ideal smoothie base."