Antonyms of adj forcible

1 sense of forcible

Sense 1
forcible, physical, strong-arm -- (impelled by physical force especially against resistance; "forcible entry"; "a real cop would get physical"; "strong-arm tactics")

INDIRECT (VIA forceful) -> forceless, unforceful -- (lacking force; feeble; "a forceless argument")

Similarity of adj forcible

1 sense of forcible

Sense 1
forcible, physical, strong-arm -- (impelled by physical force especially against resistance; "forcible entry"; "a real cop would get physical"; "strong-arm tactics")
       => 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")