If something's satisfactory it's okay — acceptable, but maybe not great. When you take a course pass/fail, your grade will be satisfactory if you meet all the requirements and do a reasonable job, or unsatisfactory if you don't.

Try not to confuse satisfactory and satisfying. If you've cooked a satisfactory turkey for Thanksgiving, your guests aren't getting sick or making excuses to leave the table, but they're probably not asking for seconds either. But if your turkey is satisfying, everybody is complimenting you on your culinary skills and probably sitting back in their chairs with contented smiles on their faces.

Definitions of satisfactory
  1. adjective
    giving satisfaction
    satisfactory living conditions”
    “his grades were satisfactory
    worthy of acceptance or satisfactory
    adequate, equal
    having the requisite qualities or resources to meet a task
    adequate, fair to middling, passable, tolerable
    about average; acceptable
    all right, fine, hunky-dory, o.k., ok, okay
    being satisfactory or in satisfactory condition
    nonstandard usage
    cheering, comforting, satisfying
    providing freedom from worry
    copacetic, copasetic, copesetic, copesettic
    completely satisfactory
    allowing you to pass (e.g., an examination or inspection) satisfactorily
    in or into a satisfactory condition
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    not giving satisfaction
    not acceptable; not welcome
    inadequate, unequal
    lacking the requisite qualities or resources to meet a task
    disappointing, dissatisfactory, unsatisfying
    not up to expectations
    below acceptable in performance
    below a satisfactory level
    not adequate to give satisfaction
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  2. adjective
    meeting requirements
    “the step makes a satisfactory seat”
    synonyms: acceptable
    having desirable or positive qualities especially those suitable for a thing specified
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