Antonyms of adj facultative

3 of 4 senses of facultative

Sense 2
facultative (vs. obligate) -- (able to exist under more than one set of conditions; "a facultative parasite can exist as a parasite or a saprophyte")

obligate (vs. facultative) -- (restricted to a particular condition of life; "an obligate anaerobe can survive only in the absence of oxygen")

Sense 3
facultative -- (granting a privilege or permission or power to do or not do something; "a facultative enactment")

INDIRECT (VIA enabling) -> disabling, disqualifying -- (depriving of legal right; rendering legally disqualified; "certain disabling restrictions disqualified him for citizenship")

Sense 4
facultative -- (not compulsory; "facultative courses in the sciences")

INDIRECT (VIA optional) -> obligatory -- (morally or legally constraining or binding; "attendance is obligatory"; "an obligatory contribution")

Similarity of adj facultative

4 senses of facultative

Sense 1
facultative -- (of or relating to the mental faculties)

Sense 2
facultative (vs. obligate) -- (able to exist under more than one set of conditions; "a facultative parasite can exist as a parasite or a saprophyte")

Sense 3
facultative -- (granting a privilege or permission or power to do or not do something; "a facultative enactment")
       => enabling (vs. disabling) -- (providing legal power or sanction; "an enabling resolution"; "enabling power")

Sense 4
facultative -- (not compulsory; "facultative courses in the sciences")
       => optional (vs. obligatory) -- (possible but not necessary; left to personal choice)