vigilant

As adjectives the difference between clever and vigilant

is that clever is nimble with hands or body; skillful; adept while vigilant is watchful, especially for danger or disorder; alert; wary.

As adjectives the difference between gallant and vigilant

is that gallant is brave, valiant or gallant can be polite and attentive to ladies; courteous to women; chivalrous while vigilant is watchful, especially for danger or disorder; alert; wary.

As a noun gallant

is (dated) fashionable young man, who is polite and attentive to women.

As a verb gallant

is (obsolete|transitive) to attend or wait on (a lady).

As adjectives the difference between vigilant and heroic

is that vigilant is watchful, especially for danger or disorder; alert; wary while heroic is of or relating to a hero or heroine; supremely noble.

Prudent is a synonym of vigilant.

As adjectives the difference between vigilant and prudent

is that vigilant is watchful, especially for danger or disorder; alert; wary while prudent is sagacious in adapting means to ends; circumspect in action, or in determining any line of conduct; careful, discreet, sensible; -- opposed to rash; directed by prudence or wise forethought; evincing prudence.

As an adjective vigilant is

watchful, especially for danger or disorder; alert; wary.

Intense is a related term of vigilant.

As adjectives the difference between intense and vigilant

is that intense is strained; tightly drawn while vigilant is watchful, especially for danger or disorder; alert; wary.

Secure is a related term of vigilant.

As adjectives the difference between secure and vigilant

is that secure is free from attack or danger; protected while vigilant is watchful, especially for danger or disorder; alert; wary.

As a verb secure

is to make safe; to relieve from apprehensions of, or exposure to, danger; to guard; to protect.

As a verb invigilate

is to oversee a test or exam.

As an adjective vigilant is

watchful, especially for danger or disorder; alert; wary.

As adjectives the difference between vigilant and judicious

is that vigilant is watchful, especially for danger or disorder; alert; wary while judicious is having, characterized by, or done with good judgment or sound thinking.

Close is a synonym of vigilant.

As adjectives the difference between close and vigilant

is that close is closed, shut while vigilant is watchful, especially for danger or disorder; alert; wary.

As a verb close

is (label) to remove a gap.

As a noun close

is an end or conclusion or close can be an enclosed field.