| fear(verb, bother, worry, dispute, challenge) |
| regret |
| scruple(verb, dispute, have, stick, challenge) |
| demur(verb, dispute, stick, challenge, doubt) |
| waver(verb, dispute, stick, challenge, doubt) |
| dread(verb, worry, avoid, fuss, fret) |
| falter(verb, worry, stick, avoid, pause) |
| hesitate(verb, dispute, stick, challenge, doubt) |
| pause(verb, hesitate, scruple) |
| apprehend(verb, worry, avoid, fuss, fret) |
| be apprehensive of(verb, dispute, challenge, doubt, question) |
| be curious(verb, dispute, challenge, doubt, question) |
| be dubious(verb, dispute, challenge, doubt, question) |
| be in a quandary(verb, dispute, challenge, doubt, question) |
| be puzzled(verb, dispute, challenge, doubt, question) |
| be uncertain(verb, dispute, challenge, doubt, question) |
| be undetermined(verb, dispute, challenge, doubt, question) |
| boggle(verb, stick, question, pause, shy) |
| call in question(verb, expression, idiom, dispute, challenge) |
| flinch(verb, worry, avoid, fuss, fret) |