Weak, impotent; insipid, bland, characterless. rare before 19th cent.

Of speech, style, emotion, a person, etc.: vapid, insipid; lacking in substance or interest; thin, feeble, weak.

Consisting of or like milk diluted with water. Hence: insipid, feeble, wishy-washy, mawkish, weakly amiable; (of a person) lacking the will or…

figurative. Devoid of animation, zest, or interest; dull, flat, lifeless, insipid. Of talk, discourse, writings, etc.

Not racy (racy, adj.1).

Sloppy, watery. Also figurative ‘watery’, ‘washy’.

figurative. Of literary style, productions, utterances, etc.: Wanting in force or vigour, feeble, sloppy, thin.

= wishy-washy, adj.

figurative. Wanting the qualities which excite interest or emotion; uninteresting, lifeless, dull, flat.