満足 and 不満: targets and degrees of evaluation
Identify what someone is satisfied or dissatisfied with, distinguishing partial evaluations from voicing a complaint.
The target of satisfaction
満足, read まんぞく, means satisfaction. 今の生活に満足しています。 expresses satisfaction with one's current life; に marks the target of the evaluation.
十分に満足しました。 says that someone was fully satisfied. Dropping 十分に weakens the degree expressed in the original.
The content of dissatisfaction
不満, read ふまん, refers to dissatisfaction or something one finds unsatisfactory. 料金に不満があります。 expresses dissatisfaction with the price or fee.
不満を言う is the action of voicing dissatisfaction. Distinguish it from having a complaint, as in 不満がある; the state alone does not prove that a protest was made.
Preserve separate evaluations
味には満足していますが、量には不満があります。 expresses satisfaction with the taste but dissatisfaction with the quantity. Do not collapse the two criteria into one overall positive or negative judgment.
特に不満はありません。 says that there are no particular complaints. It is not necessarily the same strong evaluation as being highly satisfied.
What is the target of dissatisfaction in 味には満足していますが、量には不満があります?
Show the answer and why
The quantity. Keep satisfaction with the taste separate from dissatisfaction with the quantity.