English assiduous

← English assess (mention)

← Proto-Indo-European *sed- (root)

← Latin assiduus (mention)

← Latin assidere (mention)

← Latin ad- (mention)

← Latin sedere (mention)

→ English assiduously (suffix)

→ English assiduousness (suffix)

→ English assiduity (suffix)

→ English unassiduous (prefix)