1) (of evidence) based on details that suggest something strongly but do not provide direct proof (circumstantial)

2) (to make) a conclusion, opinion, based on incomplete evidence (conjecture)

3) based on convention (and so sometimes appearing insincere) (conventional)

4) (of an argument etc) wrong because based on error (fallacious)

5) a statement about what is likely to happen, based on experience or scientific study (forecast)

6) (an act of making) a statement or decision that is based on too little detail or too few examples (generalization)

7) to form an opinion, give an answer, make a statement about (something) that is not based on very careful thought, calculation or definite knowledge (guess)

8) a statement about a person's future based on the position of the stars and planets (horoscope)

9) based on a false or impossible idea (illusory)

10) (of reasoning) based on induction (inductive)