Synonyms for unsure

Most common

uncertain · doubtful · dubious · undecided · timid · diffident

Synonyms by meaning

Adjective

Antonyms

sure, certain, positive

All antonyms of unsure →

Definitions

1. adj. 1

   uncertain, ambivalent.

   I'm still unsure whether to attend the wedding.

2. adj. 2

   unstable or precarious

Example sentences

• uncertain Tom told me that he's uncertain what he should do.
• doubtful It's doubtful whether Tom will be able to do that.
• dubious He also brought out one more dubious conclusion.
• undecided I wonder whether Tom and Mary are still undecided.
• timid She seems oddly shy and timid for a press officer.
• diffident Tom is such a diffident man. He seems to have quite low self-esteem.

Popularity over time

Use in printed books, per decade from 1850 to 2019.

By length

3 letters

shy¹

5 letters

timid²

7 letters

dubious³

8 letters

doubtful², agnostic³

9 letters

uncertain³, undecided⁴, equivocal⁴, diffident, incertain

10 letters

indefinite⁴

The small number after each word is its number of syllables (timid² = 2 syllables).