the following acts constitutes cruelty
1] actual or threatened violence
2] verbal abuse
3] excessive s*xual intercourse
4] refusal to intercourse
5] communication of veneral disease
6] neglect to discharge one's duty
7] drunkenness and use of drugs
8] forcible association with improper person.
9] false charge of immorality against wife
10] ill-treatment of children
11] lesbianism.(spicer vs. spicer,[1954] 3 All. LR 208)
sec 23(1)(b) said that cruelty complained of must not be condoned(forgiven with full knowledge) by the petitioner in any manner.