What is an adjective for someone who cannot make their own decisions? Like a follower? [duplicate]

For example, suppose Dave always did whatever his brothers would do. He would join sport teams which his friends joined and would root for whatever team the majority of the crowd would root for. He is...?

Solution 1:

Dave is "dependent", and he suffers from Dependent personality disorder, subtype "selfless"

• Dependent personality disorder It is characterized by at least 3 of the following: encouraging or allowing others to make most of one's important life decisions; subordination of one's own needs to those of others on whom one is dependent, and undue compliance with their wishes; unwillingness to make even reasonable demands on the people one depends on; feeling uncomfortable or helpless when alone, because of exaggerated fears of inability to care for oneself; preoccupation with fears of being abandoned by a person with whom one has a close relationship, and of being left to care for oneself; limited capacity to make everyday decisions without an excessive amount of advice and reassurance from others.

• subtype selfless - Merges with and immersed into another; is engulfed, enshrouded, absorbed, incorporated, willingly giving up own identity; becomes one with or an extension of another.

Solution 2:

He's a copycat:

a person or thing that copies, imitates, mimics, or follows the lead of another, as a child who says or does exactly the same as another child.

Solution 3:

Sounds like Dave (in the example) is conformist (adjective) or is a conformist (noun).

Collins:

conformist
noun
1. a person who adopts the attitudes, behaviour, dress, etc of the group to which he belongs

adjective
3. of a conforming nature or character

Collins English Dictionary. Copyright © Harper Collins Publishers

conformist graded adjective & adjective
Someone who is conformist behaves or thinks like everyone else rather than doing things that are original.

⇒ He may have to become more conformist if he is to prosper again.
⇒ Mr Gordon now feels forced into an ever more conformist way of running his practice.
A conformist is someone who is conformist.

COBUILD Advanced English Dictionary. Copyright © Harper Collins Publishers