← BackshareGuesssigmoidal/sɪɡˈmɔɪdəl/adjectiveShaped like the letter S or a curved, S-shaped curve.The artist drew a sigmoidal line that curved back and forth.The road followed a sigmoidal path through the hills.The graph of the population growth showed a sigmoidal pattern.SynonymscurvedsinuousAntonymsstraight