Antonyms of adj forceful

2 senses of forceful

Sense 1
forceful (vs. forceless) -- (characterized by or full of force or strength (often but not necessarily physical); "a forceful speaker"; "a forceful personality"; "forceful measures"; "a forceful plan for peace")

forceless (vs. forceful), unforceful -- (lacking force; feeble; "a forceless argument")
        => wimpish, wimpy -- (weak and ineffectual)

Sense 2
emphatic, forceful -- (forceful and definite in expression or action; "the document contained a particularly emphatic guarantee of religious liberty")

INDIRECT (VIA assertive) -> unassertive -- (inclined to timidity or lack of self-confidence; "a shy unassertive person")

Similarity of adj forceful

2 senses of forceful

Sense 1
forceful (vs. forceless) -- (characterized by or full of force or strength (often but not necessarily physical); "a forceful speaker"; "a forceful personality"; "forceful measures"; "a forceful plan for peace")
       => bruising -- (brutally forceful and compelling; "protected from the bruising facts of battle")
       => drastic -- (forceful and extreme and rigorous; "drastic measures")
       => emphatic, exclamatory -- (sudden and strong; "an emphatic no")
       => firm, strong -- (strong and sure; "a firm grasp"; "gave a strong pull on the rope")
       => forcible, physical, strong-arm -- (impelled by physical force especially against resistance; "forcible entry"; "a real cop would get physical"; "strong-arm tactics")
       => impellent -- (forcing forward or onward; impelling; "an impellent power"; "an impellent cause")
       => impetuous -- (marked by violent force; "impetuous heaving waves")
       => sharp -- (quick and forceful; "a sharp blow")

Sense 2
emphatic, forceful -- (forceful and definite in expression or action; "the document contained a particularly emphatic guarantee of religious liberty")
       => assertive (vs. unassertive), self-asserting, self-assertive -- (aggressively self-assured; "an energetic assertive boy who was always ready to argue"; "pointing directly at a listener is an assertive act")