Antonyms of adj diffident

2 senses of diffident

Sense 1
diffident -- (showing modest reserve; "she was diffident when offering a comment on the professor's lecture")

INDIRECT (VIA reserved) -> unreserved -- (not cautious or reticent; "unreserved behavior")

Sense 2
diffident (vs. confident), shy, timid, unsure -- (lacking self-confidence; "stood in the doorway diffident and abashed"; "problems that call for bold not timid responses"; "a very unsure young man")

confident (vs. diffident) -- (having or marked by confidence or assurance; "a confident speaker"; "a confident reply"; "his manner is more confident these days"; "confident of fulfillment")
        => assured -- (marked by assurance; exhibiting confidence; "she paints with an assured hand")
        => cocksure, overconfident, positive -- (marked by excessive confidence; "an arrogant and cocksure materialist"; "so overconfident and impudent as to speak to the queen"; "the less he knows the more positive he gets")
        => reassured -- (having confidence restored; freed from anxiety; "reassured by her praise he pressed on")
        => self-assured, self-confident -- (showing poise and confidence in your own worth; "hardly more than a boy but firm-knit and self-confident")

Similarity of adj diffident

2 senses of diffident

Sense 1
diffident -- (showing modest reserve; "she was diffident when offering a comment on the professor's lecture")
       => reserved (vs. unreserved) -- (marked by self-restraint and reticence; "was habitually reserved in speech, withholding her opinion"-Victoria Sackville-West)

Sense 2
diffident (vs. confident), shy, timid, unsure -- (lacking self-confidence; "stood in the doorway diffident and abashed"; "problems that call for bold not timid responses"; "a very unsure young man")