Synonyms-to-Be Brainteaser

[Otis]

Change one letter in each word to create a trio of synonyms. For example:
THIEF, MAID, FOREMAST → CHIEF, MAIN, FOREMOST.

1. PREVIOUS, DEAF, PRIMED

2. THICK, GULF, RECEIVE

3. BREADING, MANGERS, CLASH

4. DANDLE, GOITER, ISLE

?

 

[Otis]

I've got #1 and #4 (so far). For me, it seems easier to begin with the shortest word.

 

[Dr.Peterson]

Spoiler

1. PRECIOUS, DEAR, PRIZED

2. TRICK, GULL, DECEIVE

3. BREEDING, MANNERS, CLASS

4. DAWDLE, LOITER, IDLE

 

[Otis]

Okay, I cheated and looked at the doctor's answer. I could've solved #3 with more effort, but I've never seen one of the synonyms in #2 (verb or noun) -- although I am familiar with the adjective form.

?