---

All answers having "Unintelligent" as clue:

3 Character Answers:

---

TEA



4 Character Answers:

---

DUMB



5 Character Answers:

---

DENSE

INANE

LOOSE

WHOLE



6 Character Answers:

---

ATTICA

STUPID

TACTIC



7 Character Answers:

---

ASININE



9 Character Answers:

---

PREVALENT