reluctant (adj.)

"unwilling, strtuggling against duty or a command," 1660s, from Latin reluctantem (nominative reluctans), present participle of reluctari "to struggle against, resist, make opposition," from re- "against" (see re-) + luctari "to struggle, wrestle" (see reluctance). Related: Reluctantly. The Latin word also is the source of Spanish reluchante, Italian riluttante.

Reluctant, literally, struggling back from, implies some degree of struggle either with others who are inciting us on, or between our own inclination and some strong motive, as sense of duty, whether it operates as an impelling or as a restraining influence. [Century Dictionary]

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Definitions of reluctant from WordNet

reluctant (adj.)
unwillingness to do something contrary to your custom;
a reluctant smile
Synonyms: loath / loth
reluctant (adj.)
disinclined to become involved;
reluctant to help
they were usually reluctant to socialize
reluctant (adj.)
not eager;
foreigners stubbornly reluctant to accept our ways
fresh from college and reluctant for the moment to marry him