Islamic concepts

Wājib — required; practically mandatory

(strongly recommended, just short of obligatory

Aḥkām أحكام‎ — rules and guidelines

Ḥalāl
allowed
Farḍ
mandatory
Wājib
required
Sunnah
exemplary
Mustaḥabb or Mandub or Nafl (bonus or additional)
recommended
Mubāḥ
neutral
Makrūh Tanzihan
frowned upon
Ḥarām
not allowed
Makrūh Taḥrīman
prohibitively disliked
Ḥarām
forbidden