obligate C2+

/ˈɑbləɡeɪt/ to bind legally or morally; in biology, restricted to one mode of life

obligatory C2+

/əˈblɪɡəˌtɔri/ required by a rule, law, or custom; compulsory

unalloyed C2+

/ˌʌnəˈlɔɪd/ pure and unqualified; not mixed with anything that diminishes it

reliably C2+

/rɪˈlaɪəbli/ in a dependable, consistently good manner

obligee C2+

/ˌɑblɪˈdʒi/ a person to whom another is bound by a contract or legal obligation

obligingly C2+

/əˈblaɪdʒɪŋli/ in a helpful and accommodating manner

obligingness C2+

/əˈblaɪdʒɪŋnəs/ the quality of being eager to help and accommodate others

obligor C2+

/ˈɑblɪɡɔr/ a person who is legally bound to fulfill an obligation to another